fix: add missing commas for syntax correctness across multiple files

app/core/cache.py

@@ -46,7 +46,7 @@ class RedisCacheManager:
             if self._client is not None:
                 return
             self._client = redis.from_url(
-                settings.redis_url, encoding="utf-8", decode_responses=False
+                settings.redis_url, encoding="utf-8", decode_responses=False,
             )
             await self._refresh_availability()
 
@@ -63,7 +63,7 @@ class RedisCacheManager:
         async with self._lock:
             if self._client is None:
                 self._client = redis.from_url(
-                    settings.redis_url, encoding="utf-8", decode_responses=False
+                    settings.redis_url, encoding="utf-8", decode_responses=False,
                 )
             await self._refresh_availability()
 
@@ -127,7 +127,7 @@ async def read_json(client: Redis, key: str) -> Any | None:
 
 
 async def write_json(
-    client: Redis, key: str, value: Any, ttl_seconds: int, backoff_ms: int
+    client: Redis, key: str, value: Any, ttl_seconds: int, backoff_ms: int,
 ) -> None:
     """Serialize data to JSON and store it with TTL using retry/backoff."""
     payload = json.dumps(value, separators=(",", ":"), ensure_ascii=True).encode("utf-8")