Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

admin-frontend/nginx.conf

@@ -0,0 +1,37 @@
+server {
+    listen       80;
+    server_name  localhost;
+
+    # 静态文件服务
+    location / {
+        root   /usr/share/nginx/html;
+        index  index.html index.htm;
+        # SPA 路由支持: 找不到文件时回退到 index.html
+        try_files $uri $uri/ /index.html;
+    }
+
+    # 反向代理: 将 /admin 请求转发给管理后端
+    location /admin/ {
+        proxy_pass http://backend-admin:8001/admin/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+    
+    # 仍保留 /api 以备偶尔调用通用接口（Auth等）
+    location /api/ {
+        proxy_pass http://backend-admin:8001/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    # 静态资源代理
+    location /static/ {
+        proxy_pass http://backend-admin:8001/static/;
+    }
+
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+}