chore: 拆分app结构，将中间件、异常、子应用拆分成单独的模块

ruoyi-fastapi-backend/sub_applications/staticfiles.py

@@ -0,0 +1,7 @@
+from fastapi.staticfiles import StaticFiles
+from server import app
+from config.env import UploadConfig
+
+
+# 挂载静态文件路径
+app.mount(f"{UploadConfig.UPLOAD_PREFIX}", StaticFiles(directory=f"{UploadConfig.UPLOAD_PATH}"), name="profile")