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/Dockerfile

@@ -0,0 +1,23 @@
+# Build Stage
+FROM node:18-alpine as build-stage
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+# Production Stage
+FROM nginx:alpine as production-stage
+
+# 复制构建产物到 Nginx
+COPY --from=build-stage /app/dist /usr/share/nginx/html
+
+# 复制自定义 Nginx 配置 (处理 SPA 路由)
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]