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/exceptions/exception.py

@@ -0,0 +1,28 @@
+class LoginException(Exception):
+    """
+    自定义登录异常LoginException
+    """
+
+    def __init__(self, data: str = None, message: str = None):
+        self.data = data
+        self.message = message
+
+
+class AuthException(Exception):
+    """
+    自定义令牌异常AuthException
+    """
+
+    def __init__(self, data: str = None, message: str = None):
+        self.data = data
+        self.message = message
+
+
+class PermissionException(Exception):
+    """
+    自定义权限异常PermissionException
+    """
+
+    def __init__(self, data: str = None, message: str = None):
+        self.data = data
+        self.message = message