Add FastAPI backend with agent system

backend/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# 安装依赖
+COPY pyproject.toml .
+RUN pip install --no-cache-dir uv && \
+    uv pip install --system --no-cache -r pyproject.toml
+
+# 安装可选依赖
+RUN uv pip install --system --no-cache pymupdf python-docx
+
+# 复制代码
+COPY app/ ./app/
+
+# 创建数据目录
+RUN mkdir -p /data/jarvis/data /data/jarvis/chroma /data/jarvis/uploads
+
+EXPOSE 8000
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]