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

backend/Dockerfile

@@ -0,0 +1,27 @@
+FROM python:3.11-slim
+
+WORKDIR /app
+
+# 安装系统依赖 (如果需要)
+# RUN apt-get update && apt-get install -y gcc libpq-dev && rm -rf /var/lib/apt/lists/*
+
+# 复制项目文件
+COPY pyproject.toml .
+# 复制源码
+COPY app ./app
+COPY alembic ./alembic
+COPY alembic.ini .
+
+# 安装依赖
+# 使用 pip 安装当前目录 (.)，会自动解析 pyproject.toml
+RUN pip install --no-cache-dir .
+
+# 创建静态文件目录 (用于存放生成的图片)
+RUN mkdir -p static/images
+
+# 暴露端口
+EXPOSE 8000
+
+# 启动命令
+# 生产环境建议使用 gunicorn 或 uvicorn --workers
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]