refactor: use contextlib.suppress and sort __slots__ in backends

fastapi_traffic/backends/memory.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import asyncio
+import contextlib
 import time
 from collections import OrderedDict
 from typing import Any
@@ -13,7 +14,7 @@ from fastapi_traffic.backends.base import Backend
 class MemoryBackend(Backend):
     """Thread-safe in-memory backend with LRU eviction and TTL support."""
 
-    __slots__ = ("_data", "_lock", "_max_size", "_cleanup_interval", "_cleanup_task")
+    __slots__ = ("_cleanup_interval", "_cleanup_task", "_data", "_lock", "_max_size")
 
     def __init__(
         self,
@@ -127,10 +128,8 @@ class MemoryBackend(Backend):
         """Stop cleanup task and clear data."""
         if self._cleanup_task is not None:
             self._cleanup_task.cancel()
-            try:
+            with contextlib.suppress(asyncio.CancelledError):
                 await self._cleanup_task
-            except asyncio.CancelledError:
-                pass
             self._cleanup_task = None
         await self.clear()