feat: v2.5 社媒分享功能 + 面包屑优化

新增功能：
- 社媒分享：一键生成多平台分享文案
  - 支持8个平台：通用、小红书、抖音、B站、微信公众号、朋友圈、X (Twitter)、LinkedIn
  - 智能生成适配各平台特点的文案（字数限制、风格、内容丰富度）
  - 集成DeepSeek AI自动生成 + 规则模板回退
  - "分享"按钮支持直接跳转到平台发布后台
  - X (Twitter)支持预填充文案
  - 自动复制文案到剪贴板

优化改进：
- 面包屑导航：修复折行问题，确保始终单行显示
  - 添加 white-space: nowrap 和 flex-shrink: 0
  - 长标题自动省略显示
- 社媒分享按钮文案：从"一键生成社媒分享"改为"分享"
- 更新Twitter为X，使用x.com域名

技术实现：
- 前端：detail_new.html 新增分享弹窗和交互逻辑
- 后端：app.py 新增 /api/generate-social-share 接口
- 支持按平台定制文案内容和格式

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app.py

@@ -239,6 +239,204 @@ def create_app(config_name='default'):
 
         return render_template('detail_new.html', site=site, news_list=news_list, recommended_sites=recommended_sites)
 
+    # ========== 社媒营销路由 (v2.5新增) ==========
+    @app.route('/api/generate-social-share', methods=['POST'])
+    def generate_social_share():
+        """一键生成社媒分享文案（前台可访问）"""
+        try:
+            data = request.get_json() or {}
+            site_code = (data.get('site_code') or '').strip()
+            platforms = data.get('platforms') or []
+
+            if not site_code:
+                return jsonify({'success': False, 'message': '请提供网站编码'}), 400
+
+            site = Site.query.filter_by(code=site_code, is_active=True).first()
+            if not site:
+                return jsonify({'success': False, 'message': '网站不存在或未启用'}), 404
+
+            # 允许的平台列表（前端也会限制，这里再做一次兜底）
+            allowed_platforms = {
+                'universal',
+                'xiaohongshu',
+                'douyin',
+                'bilibili',
+                'wechat',
+                'moments',
+                'x',
+                'linkedin'
+            }
+
+            if not isinstance(platforms, list):
+                platforms = []
+            platforms = [p for p in platforms if isinstance(p, str)]
+            platforms = [p.strip().lower() for p in platforms if p.strip()]
+            platforms = [p for p in platforms if p in allowed_platforms]
+
+            # 默认生成通用模板
+            if not platforms:
+                platforms = ['universal']
+
+            # 组织站点信息
+            site_info = {
+                'name': site.name,
+                'url': site.url,
+                'short_desc': site.short_desc or '',
+                'description': (site.description or '')[:1200],
+                'features': (site.features or '')[:1200],
+                'tags': [t.name for t in (site.tags or [])]
+            }
+
+            # 尝试使用PromptTemplate + DeepSeek生成
+            from utils.tag_generator import TagGenerator
+            generator = TagGenerator()
+            prompt = PromptTemplate.query.filter_by(key='social_share', is_active=True).first()
+
+            generated = {}
+
+            if prompt and generator.client:
+                # 构造提示词变量
+                tags_text = ','.join(site_info['tags'])
+                user_prompt = prompt.user_prompt_template.format(
+                    name=site_info['name'],
+                    url=site_info['url'],
+                    short_desc=site_info['short_desc'],
+                    description=site_info['description'],
+                    features=site_info['features'],
+                    tags=tags_text,
+                    platforms=','.join(platforms)
+                )
+
+                try:
+                    resp = generator.client.chat.completions.create(
+                        model='deepseek-chat',
+                        messages=[
+                            {'role': 'system', 'content': prompt.system_prompt},
+                            {'role': 'user', 'content': user_prompt}
+                        ],
+                        temperature=0.7,
+                        max_tokens=1200
+                    )
+                    text = (resp.choices[0].message.content or '').strip()
+                    # 约定：模型返回JSON字符串；若不是JSON则回退到纯文本放到universal
+                    import json as _json
+                    try:
+                        parsed = _json.loads(text)
+                        if isinstance(parsed, dict):
+                            for k, v in parsed.items():
+                                if isinstance(k, str) and isinstance(v, str) and k in allowed_platforms:
+                                    generated[k] = v.strip()
+                    except Exception:
+                        generated['universal'] = text
+                except Exception as e:
+                    # AI失败不影响整体，回退模板
+                    print(f"社媒文案AI生成失败：{str(e)}")
+
+            # 回退：规则模板（根据各平台字数限制优化）
+            def build_fallback(p):
+                name = site_info['name']
+                url = site_info['url']
+                short_desc = site_info['short_desc'] or ''
+                full_desc = site_info['description'] or ''
+                features = site_info['features'] or ''
+                tags = site_info['tags'][:6]
+                tags_line = ' ' + ' '.join([f"#{t}" for t in tags]) if tags else ''
+
+                # X (Twitter) - 280字符限制，简洁为主
+                if p == 'x':
+                    desc = (short_desc or full_desc)[:100]
+                    base = f"🔥 {name}\n\n{desc}\n\n🔗 {url}{tags_line}"
+                    return base[:280]
+
+                # LinkedIn - 3000字限制，专业风格
+                if p == 'linkedin':
+                    desc = (full_desc or short_desc)[:500]
+                    content = f"💡 推荐一个实用工具：{name}\n\n📝 简介：\n{desc}\n\n"
+                    if features:
+                        features_list = features.split('\n')[:3]
+                        content += f"✨ 主要功能：\n" + '\n'.join([f"• {f.strip()}" for f in features_list if f.strip()][:3]) + "\n\n"
+                    content += f"🔗 官网：{url}\n\n"
+                    if tags:
+                        content += f"📌 适用场景：{', '.join(tags)}"
+                    return content[:3000]
+
+                # 小红书 - 2000字限制，图文风格
+                if p == 'xiaohongshu':
+                    desc = (short_desc or full_desc)[:300]
+                    content = f"✨ {name} | 我最近在用的宝藏工具\n\n"
+                    content += f"📌 一句话介绍：\n{desc}\n\n"
+                    if features:
+                        features_list = features.split('\n')[:5]
+                        content += f"🎯 核心功能：\n" + '\n'.join([f"✓ {f.strip()}" for f in features_list if f.strip()][:5]) + "\n\n"
+                    content += f"🔗 体验入口：{url}\n\n{tags_line}"
+                    return content[:2000]
+
+                # 抖音 - 2000字限制，短视频文案风格
+                if p == 'douyin':
+                    desc = (short_desc or full_desc)[:200]
+                    content = f"🔥 发现一个超好用的工具：{name}\n\n"
+                    content += f"💡 {desc}\n\n"
+                    if features:
+                        features_list = features.split('\n')[:3]
+                        content += "✨ 亮点功能：\n" + '\n'.join([f"👉 {f.strip()}" for f in features_list if f.strip()][:3]) + "\n\n"
+                    content += f"🔗 想试试戳：{url}\n\n{tags_line}"
+                    return content[:2000]
+
+                # B站 - 20000字限制，专栏风格
+                if p == 'bilibili':
+                    desc = (full_desc or short_desc)[:800]
+                    content = f"【分享】{name} - 值得一试的优质工具\n\n"
+                    content += f"## 📖 工具简介\n{desc}\n\n"
+                    if features:
+                        content += f"## ✨ 主要功能\n{features}\n\n"
+                    content += f"## 🔗 体验地址\n{url}\n\n"
+                    if tags:
+                        content += f"## 🏷️ 相关标签\n{' / '.join(tags)}"
+                    return content[:20000]
+
+                # 微信公众号 - 基本无限制，正式风格
+                if p == 'wechat':
+                    desc = (full_desc or short_desc)[:600]
+                    content = f"今天给大家分享一个实用工具：{name}\n\n"
+                    content += f"📝 工具介绍\n{desc}\n\n"
+                    if features:
+                        content += f"✨ 核心功能\n{features}\n\n"
+                    content += f"🔗 官方网站\n{url}\n\n"
+                    if tags:
+                        content += f"如果你也在关注「{' · '.join(tags)}」相关的工具，不妨收藏一下这个实用的选择。"
+                    return content
+
+                # 朋友圈 - 简短为主
+                if p == 'moments':
+                    desc = (short_desc or full_desc)[:80]
+                    return f"💡 {name}\n{desc}\n🔗 {url}{tags_line}".strip()
+
+                # 通用模板
+                desc = (full_desc or short_desc)[:300]
+                return f"{name}\n\n{desc}\n\n{url}{tags_line}".strip()
+
+            results = {}
+            for p in platforms:
+                results[p] = generated.get(p) or build_fallback(p)
+
+            # 统一补充一个通用版本
+            if 'universal' not in results:
+                results['universal'] = generated.get('universal') or build_fallback('universal')
+
+            return jsonify({
+                'success': True,
+                'site': {
+                    'code': site.code,
+                    'name': site.name,
+                    'url': site.url
+                },
+                'platforms': platforms,
+                'content': results
+            })
+
+        except Exception as e:
+            return jsonify({'success': False, 'message': f'生成失败: {str(e)}'}), 500
+
     # ========== 后台登录路由 ==========
     @app.route('/admin/login', methods=['GET', 'POST'])
     def admin_login():

templates/detail_new.html

@@ -80,19 +80,25 @@
         padding: 12px 0;
         font-size: 14px;
         color: var(--text-secondary);
-        flex-wrap: wrap;
+        flex-wrap: nowrap;
+        white-space: nowrap;
+        overflow-x: auto;
+        overflow-y: hidden;
     }
 
     .breadcrumb-item {
-        display: flex;
+        display: inline-flex;
         align-items: center;
         gap: 8px;
+        flex-shrink: 0;
+        white-space: nowrap;
     }
 
     .breadcrumb-item a {
         color: var(--text-secondary);
         text-decoration: none;
         transition: color 0.2s;
+        white-space: nowrap;
     }
 
     .breadcrumb-item a:hover {
@@ -102,11 +108,16 @@
     .breadcrumb-item.active {
         color: var(--text-primary);
         font-weight: 500;
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        max-width: 300px;
     }
 
     .breadcrumb-separator {
         color: var(--text-muted);
         user-select: none;
+        flex-shrink: 0;
     }
 
     /* 返回链接 */
@@ -715,8 +726,41 @@
                 访问网站
                 <span>↗</span>
             </a>
+
+            <!-- v2.5新增：社媒分享入口 -->
+            <button type="button" class="share-btn" onclick="openShareModal()">
+                分享
+                <span>✦</span>
+            </button>
+
             <p class="visit-hint">在新标签页打开 • {{ site.url.split('/')[2] if site.url else '' }}</p>
         </div>
+
+        <!-- v2.5新增：社媒分享弹窗 -->
+        <div id="shareModal" class="share-modal" style="display:none;">
+            <div class="share-modal-backdrop" onclick="closeShareModal()"></div>
+            <div class="share-modal-card" role="dialog" aria-modal="true" aria-label="社媒分享文案">
+                <div class="share-modal-header">
+                    <div>
+                        <div class="share-modal-title">社媒分享文案</div>
+                        <div class="share-modal-subtitle">{{ site.name }} · 一键生成/一键复制</div>
+                    </div>
+                    <button type="button" class="share-modal-close" onclick="closeShareModal()">×</button>
+                </div>
+
+                <div class="share-platform-tabs" id="shareTabs"></div>
+
+                <div class="share-content">
+                    <textarea id="shareText" class="share-textarea" rows="10" readonly placeholder="点击生成后显示内容..."></textarea>
+                    <div class="share-actions">
+                        <button type="button" id="shareGenerateBtn" class="share-action-primary" onclick="generateShare()">生成文案</button>
+                        <button type="button" class="share-action-share" onclick="shareToplatform()">分享</button>
+                        <button type="button" class="share-action-secondary" onclick="copyShare()">复制</button>
+                    </div>
+                    <div id="shareStatus" class="share-status" style="display:none;"></div>
+                </div>
+            </div>
+        </div>
     </div>
 
     <!-- 内容布局 -->
@@ -952,4 +996,372 @@ function refreshNews(siteCode) {
 }
 </script>
 
+<style>
+.share-btn {
+    margin-top: 12px;
+    width: 100%;
+    padding: 12px;
+    border-radius: var(--radius-md);
+    border: 1px solid rgba(14, 165, 233, 0.35);
+    background: rgba(14, 165, 233, 0.08);
+    color: var(--primary-dark);
+    font-weight: 700;
+    font-size: 14px;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 8px;
+    transition: all 0.2s;
+}
+
+.share-btn:hover {
+    background: rgba(14, 165, 233, 0.12);
+    transform: translateY(-1px);
+}
+
+.share-modal {
+    position: fixed;
+    inset: 0;
+    z-index: 2000;
+}
+
+.share-modal-backdrop {
+    position: absolute;
+    inset: 0;
+    background: rgba(15, 23, 42, 0.55);
+}
+
+.share-modal-card {
+    position: relative;
+    width: min(720px, calc(100vw - 32px));
+    margin: 72px auto 0;
+    background: var(--bg-white);
+    border: 1px solid var(--border-color);
+    border-radius: var(--radius-lg);
+    box-shadow: var(--shadow-lg);
+    overflow: hidden;
+}
+
+.share-modal-header {
+    display: flex;
+    align-items: flex-start;
+    justify-content: space-between;
+    gap: 16px;
+    padding: 18px 20px;
+    border-bottom: 1px solid var(--border-color);
+    background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(139, 92, 246, 0.08) 100%);
+}
+
+.share-modal-title {
+    font-size: 16px;
+    font-weight: 800;
+    color: var(--text-primary);
+}
+
+.share-modal-subtitle {
+    font-size: 12px;
+    color: var(--text-secondary);
+    margin-top: 2px;
+}
+
+.share-modal-close {
+    width: 32px;
+    height: 32px;
+    border-radius: 8px;
+    border: 1px solid var(--border-color);
+    background: var(--bg-white);
+    cursor: pointer;
+    font-size: 18px;
+    line-height: 1;
+    color: var(--text-secondary);
+}
+
+.share-platform-tabs {
+    display: flex;
+    gap: 8px;
+    padding: 14px 20px 0;
+    flex-wrap: wrap;
+}
+
+.share-tab {
+    padding: 8px 12px;
+    border-radius: 999px;
+    border: 1px solid var(--border-color);
+    background: #f8fafc;
+    color: var(--text-secondary);
+    font-size: 13px;
+    cursor: pointer;
+    transition: all 0.15s;
+}
+
+.share-tab.active {
+    background: rgba(14, 165, 233, 0.12);
+    border-color: rgba(14, 165, 233, 0.35);
+    color: var(--primary-dark);
+    font-weight: 700;
+}
+
+.share-content {
+    padding: 14px 20px 20px;
+}
+
+.share-textarea {
+    width: 100%;
+    border: 1px solid var(--border-color);
+    border-radius: 12px;
+    padding: 12px;
+    font-size: 14px;
+    line-height: 1.6;
+    resize: vertical;
+    min-height: 180px;
+    background: var(--bg-page);
+}
+
+.share-actions {
+    display: flex;
+    gap: 10px;
+    justify-content: flex-end;
+    margin-top: 12px;
+}
+
+.share-action-primary,
+.share-action-share,
+.share-action-secondary {
+    padding: 10px 14px;
+    border-radius: 10px;
+    border: 1px solid var(--border-color);
+    cursor: pointer;
+    font-weight: 700;
+    transition: all 0.2s;
+}
+
+.share-action-primary {
+    background: var(--primary-blue);
+    border-color: rgba(14, 165, 233, 0.6);
+    color: white;
+}
+
+.share-action-primary:disabled {
+    opacity: 0.65;
+    cursor: not-allowed;
+}
+
+.share-action-share {
+    background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
+    border-color: rgba(139, 92, 246, 0.6);
+    color: white;
+}
+
+.share-action-share:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
+}
+
+.share-action-secondary {
+    background: var(--bg-white);
+    color: var(--text-primary);
+}
+
+.share-status {
+    margin-top: 10px;
+    font-size: 13px;
+    color: var(--text-secondary);
+}
+
+.share-status.success { color: #16a34a; }
+.share-status.error { color: #dc2626; }
+
+@media (max-width: 520px) {
+    .share-modal-card { margin-top: 56px; }
+    .share-actions { flex-direction: column; }
+    .share-action-primary,
+    .share-action-share,
+    .share-action-secondary { width: 100%; }
+}
+</style>
+
+<script>
+const SHARE_PLATFORMS = [
+  { key: 'universal', label: '通用', publishUrl: null },
+  { key: 'xiaohongshu', label: '小红书', publishUrl: 'https://creator.xiaohongshu.com/publish/publish' },
+  { key: 'douyin', label: '抖音', publishUrl: 'https://creator.douyin.com/creator-micro/content/publish' },
+  { key: 'bilibili', label: 'B站', publishUrl: 'https://member.bilibili.com/platform/upload/text/edit' },
+  { key: 'wechat', label: '公众号', publishUrl: 'https://mp.weixin.qq.com' },
+  { key: 'moments', label: '朋友圈', publishUrl: null },
+  { key: 'x', label: 'X (Twitter)', publishUrl: 'https://x.com/intent/tweet' },
+  { key: 'linkedin', label: 'LinkedIn', publishUrl: 'https://www.linkedin.com/feed/' },
+];
+
+let shareActivePlatform = 'universal';
+let shareContentCache = {};
+
+function openShareModal() {
+  const modal = document.getElementById('shareModal');
+  if (!modal) return;
+  modal.style.display = 'block';
+
+  renderShareTabs();
+  setSharePlatform(shareActivePlatform);
+
+  document.addEventListener('keydown', onShareEsc);
+}
+
+function closeShareModal() {
+  const modal = document.getElementById('shareModal');
+  if (!modal) return;
+  modal.style.display = 'none';
+  document.removeEventListener('keydown', onShareEsc);
+}
+
+function onShareEsc(e) {
+  if (e.key === 'Escape') closeShareModal();
+}
+
+function renderShareTabs() {
+  const tabs = document.getElementById('shareTabs');
+  if (!tabs) return;
+  tabs.innerHTML = '';
+
+  SHARE_PLATFORMS.forEach(p => {
+    const btn = document.createElement('button');
+    btn.type = 'button';
+    btn.className = 'share-tab' + (p.key === shareActivePlatform ? ' active' : '');
+    btn.textContent = p.label;
+    btn.onclick = () => setSharePlatform(p.key);
+    tabs.appendChild(btn);
+  });
+}
+
+function setSharePlatform(platformKey) {
+  shareActivePlatform = platformKey;
+  renderShareTabs();
+  const textarea = document.getElementById('shareText');
+  if (!textarea) return;
+  textarea.value = shareContentCache[platformKey] || '';
+
+  const status = document.getElementById('shareStatus');
+  if (status) status.style.display = 'none';
+}
+
+function setShareStatus(type, message) {
+  const el = document.getElementById('shareStatus');
+  if (!el) return;
+  el.className = 'share-status' + (type ? ' ' + type : '');
+  el.textContent = message;
+  el.style.display = 'block';
+}
+
+function generateShare() {
+  const btn = document.getElementById('shareGenerateBtn');
+  if (btn) {
+    btn.disabled = true;
+    btn.textContent = '生成中...';
+  }
+
+  setShareStatus('', '正在生成文案，请稍候...');
+
+  const payload = {
+    site_code: '{{ site.code }}',
+    platforms: SHARE_PLATFORMS.map(p => p.key)
+  };
+
+  fetch('/api/generate-social-share', {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify(payload)
+  })
+    .then(r => r.json())
+    .then(data => {
+      if (!data || !data.success) {
+        throw new Error((data && data.message) ? data.message : '生成失败');
+      }
+      shareContentCache = data.content || {};
+      setSharePlatform(shareActivePlatform);
+      setShareStatus('success', '已生成，可直接复制使用。');
+    })
+    .catch(err => {
+      setShareStatus('error', err.message || '网络请求失败');
+    })
+    .finally(() => {
+      if (btn) {
+        btn.disabled = false;
+        btn.textContent = '生成文案';
+      }
+    });
+}
+
+function copyShare() {
+  const textarea = document.getElementById('shareText');
+  if (!textarea) return;
+  const text = textarea.value || '';
+  if (!text.trim()) {
+    setShareStatus('error', '没有可复制的内容，请先生成。');
+    return;
+  }
+
+  const doFallback = () => {
+    textarea.focus();
+    textarea.select();
+    try {
+      document.execCommand('copy');
+      setShareStatus('success', '已复制到剪贴板');
+    } catch (e) {
+      setShareStatus('error', '复制失败，请手动选择复制');
+    }
+  };
+
+  if (navigator.clipboard && navigator.clipboard.writeText) {
+    navigator.clipboard.writeText(text)
+      .then(() => setShareStatus('success', '已复制到剪贴板'))
+      .catch(() => doFallback());
+  } else {
+    doFallback();
+  }
+}
+
+function shareToplatform() {
+  const textarea = document.getElementById('shareText');
+  if (!textarea) return;
+  const text = textarea.value || '';
+
+  if (!text.trim()) {
+    setShareStatus('error', '请先生成文案后再分享');
+    return;
+  }
+
+  // 查找当前平台配置
+  const platform = SHARE_PLATFORMS.find(p => p.key === shareActivePlatform);
+
+  if (!platform) {
+    setShareStatus('error', '未知平台');
+    return;
+  }
+
+  // 如果平台没有发布URL，提示用户
+  if (!platform.publishUrl) {
+    setShareStatus('error', `${platform.label}暂不支持直接跳转，请手动复制后前往平台发布`);
+    return;
+  }
+
+  // 根据平台处理跳转
+  let shareUrl = platform.publishUrl;
+
+  // X (Twitter) 支持预填充文本
+  if (platform.key === 'x') {
+    const encodedText = encodeURIComponent(text);
+    shareUrl = `${platform.publishUrl}?text=${encodedText}`;
+  }
+
+  // 打开发布页面
+  window.open(shareUrl, '_blank');
+  setShareStatus('success', `正在跳转到${platform.label}发布页面...`);
+
+  // 自动复制文案到剪贴板
+  if (navigator.clipboard && navigator.clipboard.writeText) {
+    navigator.clipboard.writeText(text).catch(() => {});
+  }
+}
+</script>
+
 {% endblock %}