重写成 FastAPI (#3)

* 重写成FastAPI

* 修改依赖相关配置
- pyproject `uvicorn[standard] -> fastapi[standard]`
- requirements.txt 使用 `uv export` 生成
- Dockerfile 换用 `python:3.13`
- README pip 安装增加版本提示

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Co-authored-by: wyf9 <wyf9@wyf9.top>

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.9
+FROM python:3.13
 
 WORKDIR /app
 
@@ -6,4 +6,4 @@ COPY . .
 RUN pip install gunicorn && pip install -r requirements.txt
 EXPOSE 8000
 
-CMD ["gunicorn", "-b", "0.0.0.0:8000", "app:app"]
+CMD ["gunicorn", "-b", "0.0.0.0:8000", "app:app"]