refactor: reorganize imports and improve logging in middleware

Author: tdduydev

app/__init__.py

@@ -17,7 +17,8 @@
 
 from app.auth import ApiKeyMiddleware
 from app.config import settings
-from app.metrics import MetricsMiddleware, router as metrics_router
+from app.metrics import MetricsMiddleware
+from app.metrics import router as metrics_router
 from app.rate_limit import RateLimitMiddleware
 from app.routes import system_router, tts_router
 from app.tts_engine import tts_cache

app/auth.py

@@ -47,11 +47,15 @@ async def dispatch(self, request: Request, call_next):
         if not provided:
             return JSONResponse(
                 status_code=401,
-                content={"error": "Missing API key", "detail": "Provide X-API-Key header or ?api_key= param"},
+                content={
+                    "error": "Missing API key",
+                    "detail": "Provide X-API-Key header or ?api_key= param",
+                },
             )
 
         if not hmac.compare_digest(provided, self.api_key):
-            log.warning(f"Invalid API key from {request.client.host if request.client else 'unknown'}")
+            client_ip = request.client.host if request.client else "unknown"
+            log.warning(f"Invalid API key from {client_ip}")
             return JSONResponse(
                 status_code=403,
                 content={"error": "Invalid API key"},

app/routes/system.py

@@ -6,8 +6,8 @@
 import edge_tts
 from fastapi import APIRouter
 
-from app.config import settings
 from app import tts_engine
+from app.config import settings
 from app.tts_engine import ensure_voices_loaded, stats, tts_cache
 
 router = APIRouter(tags=["System"])

app/routes/tts.py

@@ -1,7 +1,6 @@
 """TTS API routes — POST /tts, POST /tts/stream, POST /tts/async."""
 from __future__ import annotations
 
-import asyncio
 import base64
 import io
 import json