feat: scaffold modular monolith backend architecture

Dockerfile

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# 安装基础编译依赖
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    libpq-dev \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# 安装 Python 依赖
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# 复制代码
+COPY . .
+
+EXPOSE 8080
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8080", "--workers", "4"]