fix: 修复 Dockerfile 中的启动命令路径

将 CMD 从 'uvicorn main:app' 修改为 'uvicorn app.main:app'，
以匹配实际的应用入口文件位置 (app/main.py)。

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Dockerfile

@@ -8,4 +8,4 @@ RUN pip install --no-cache-dir -i https://pypi.tuna.tsinghua.edu.cn/simple -r re
 
 COPY . .
 
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]