Fix SeriesApp: Add missing class variable and clean up unused imports

src/server/web/middleware/fastapi_auth_middleware.py

@@ -6,8 +6,9 @@ using FastAPI patterns and dependency injection.
 """
 
 import logging
-from typing import Callable, Optional, Dict, Any
-from fastapi import Request, Response, HTTPException, status
+from typing import Any, Callable, Dict, Optional
+
+from fastapi import HTTPException, Request, Response, status
 from fastapi.responses import JSONResponse
 
 

src/server/web/middleware/fastapi_logging_middleware.py

@@ -12,10 +12,11 @@ import json
 import logging
 import time
 import traceback
-from typing import Callable, Dict, Any, Optional
-from fastapi import Request, Response, HTTPException, status
-from fastapi.responses import JSONResponse
 from datetime import datetime, timezone
+from typing import Any, Callable, Dict, Optional
+
+from fastapi import HTTPException, Request, Response, status
+from fastapi.responses import JSONResponse
 
 
 class EnhancedLoggingMiddleware:

src/server/web/middleware/fastapi_validation_middleware.py

@@ -5,13 +5,14 @@ This module provides middleware for handling request validation logic
 using FastAPI patterns and dependency injection.
 """
 
+import html
 import json
 import logging
-from typing import Callable, Dict, Any, Optional, Union
-from fastapi import Request, Response, HTTPException, status
-from fastapi.responses import JSONResponse
-import html
 import re
+from typing import Any, Callable, Dict, Optional, Union
+
+from fastapi import HTTPException, Request, Response, status
+from fastapi.responses import JSONResponse
 
 
 class ValidationMiddleware: