feat: 集成 DeepSeek AI 服务

- 新增 backend 服务 (Express + TypeScript)
- 前端表单提交改为调用后端 API
- DeepSeek 增强分析结果，本地规则作为 fallback
- Docker 双容器部署：web (Nginx) + backend
- Nginx 反向代理 /api 到后端服务
- 本地开发支持 Vite 代理 + backend:dev 脚本

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/types/index.ts

@@ -1,47 +1,10 @@
-export interface UserInput {
-  birthDate: string; // YYYY-MM-DD
-  birthTime: string; // HH:mm
-  gender: 'male' | 'female';
-  birthPlace: string;
-}
-
-export interface FortuneProfile {
-  wuxing: 'wood' | 'fire' | 'earth' | 'metal' | 'water';
-  wuxingLabel: string;
-  personality: string[];
-  strengths: string[];
-  weaknesses: string[];
-  developmentRhythm: 'stable' | 'growth' | 'breakthrough' | 'accumulation';
-}
-
-export interface CompanyRecommendation {
-  type: string;
-  matchScore: number;
-  reasons: string[];
-  suitableFor: string[];
-  notSuitableFor: string[];
-  stageAdvice: string;
-}
-
-export interface JobRecommendation {
-  category: string;
-  matchScore: number;
-  reasons: string[];
-  suitableWorkStyle: string[];
-  notSuitableFor: string[];
-}
-
-export interface StageAdvice {
-  overall: string;
-  careerDirection: string;
-  jobChangeTiming: string;
-  platformPreference: string;
-  keyObservations: string[];
-}
-
-export interface FortuneResult {
-  profile: FortuneProfile;
-  companyRecommendations: CompanyRecommendation[];
-  jobRecommendations: JobRecommendation[];
-  stageAdvice: StageAdvice;
-}
+export type {
+  UserInput,
+  FortuneProfile,
+  CompanyRecommendation,
+  JobRecommendation,
+  StageAdvice,
+  FortuneResult,
+  FortuneAnalyzeMeta,
+  FortuneAnalyzeResponse,
+} from '../../shared/types';