fix: v2.1.0补充提交 - 配置完善和功能修复

修复内容：
- 完善tag_generator.py的generate_description方法
- 优化index_new.html首页图标CSS
- 更新templates/admin登录页面和后台模板
- 完善config.py配置
- 更新requirements.txt依赖列表
- 优化.gitignore规则

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

templates/admin/master.html

@@ -85,6 +85,12 @@
                             <span class="nav-text">批量导入</span>
                         </a>
                     </li>
+                    <li class="nav-item">
+                        <a href="{{ url_for('change_password') }}" class="nav-link">
+                            <span class="material-symbols-outlined nav-icon">lock_reset</span>
+                            <span class="nav-text">修改密码</span>
+                        </a>
+                    </li>
                     <li class="nav-item">
                         <a href="{{ url_for('index') }}" class="nav-link" target="_blank">
                             <span class="material-symbols-outlined nav-icon">open_in_new</span>