style: clean up unused parameters and imports in examples

examples/04_key_extractors.py

@@ -9,8 +9,8 @@ from fastapi.responses import JSONResponse
 
 from fastapi_traffic import (
     MemoryBackend,
-    RateLimitExceeded,
     RateLimiter,
+    RateLimitExceeded,
     rate_limit,
 )
 from fastapi_traffic.core.limiter import set_limiter
@@ -20,7 +20,7 @@ limiter = RateLimiter(backend)
 
 
 @asynccontextmanager
-async def lifespan(app: FastAPI):
+async def lifespan(_: FastAPI):
     await limiter.initialize()
     set_limiter(limiter)
     yield
@@ -31,7 +31,7 @@ app = FastAPI(title="Custom Key Extractors", lifespan=lifespan)
 
 
 @app.exception_handler(RateLimitExceeded)
-async def rate_limit_handler(request: Request, exc: RateLimitExceeded) -> JSONResponse:
+async def rate_limit_handler(_: Request, exc: RateLimitExceeded) -> JSONResponse:
     return JSONResponse(
         status_code=429,
         content={"error": "rate_limit_exceeded", "retry_after": exc.retry_after},
@@ -43,7 +43,10 @@ async def rate_limit_handler(request: Request, exc: RateLimitExceeded) -> JSONRe
 @rate_limit(10, 60)  # Uses default IP-based key extractor
 async def by_ip(request: Request) -> dict[str, str]:
     """Rate limited by client IP address (default behavior)."""
-    return {"limited_by": "ip", "client_ip": request.client.host if request.client else "unknown"}
+    return {
+        "limited_by": "ip",
+        "client_ip": request.client.host if request.client else "unknown",
+    }
 
 
 # 2. Rate limit by API key
@@ -99,7 +102,7 @@ def endpoint_ip_extractor(request: Request) -> str:
     window_size=60,
     key_extractor=endpoint_ip_extractor,
 )
-async def endpoint_specific(request: Request) -> dict[str, str]:
+async def endpoint_specific(_: Request) -> dict[str, str]:
     """Each endpoint has its own rate limit counter."""
     return {"limited_by": "endpoint+ip"}