fix Dockerfile by adapting uv package management

Dockerfile

@@ -2,8 +2,21 @@ FROM python:3.14-slim
 
 WORKDIR /app
 
+# 安装系统依赖（curl + 构建依赖）
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# 安装 uv
+RUN pip install --no-cache-dir uv
+
+# 先复制依赖文件
+COPY pyproject.toml uv.lock ./
+
+# 用 uv 安装依赖
+RUN uv sync --system
+
+# 再复制代码
 COPY . .
 
-RUN pip install --no-cache-dir fastapi uvicorn sqlalchemy psycopg2-binary httpx python-jose
-
 CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]