chore(backend): standardize multiline formatting across modules

Reformatted multiline function calls, object definitions, and queries for improved code readability and consistency. Adjusted imports and constraints where necessary.

backend/app/core/redis.py

@@ -243,7 +243,9 @@ class RedisClient:
         try:
             client = await self._get_client()
             result = await client.expire(key, ttl)
-            logger.debug(f"Cache expire for key: {key} (TTL: {ttl}s, success: {result})")
+            logger.debug(
+                f"Cache expire for key: {key} (TTL: {ttl}s, success: {result})"
+            )
             return result
         except (ConnectionError, TimeoutError) as e:
             logger.error(f"Redis cache_expire failed for key '{key}': {e}")
@@ -323,9 +325,7 @@ class RedisClient:
             return 0
 
     @asynccontextmanager
-    async def subscribe(
-        self, *channels: str
-    ) -> AsyncGenerator[PubSub, None]:
+    async def subscribe(self, *channels: str) -> AsyncGenerator[PubSub, None]:
         """
         Subscribe to one or more channels.
 
@@ -353,9 +353,7 @@ class RedisClient:
             logger.debug(f"Unsubscribed from channels: {channels}")
 
     @asynccontextmanager
-    async def psubscribe(
-        self, *patterns: str
-    ) -> AsyncGenerator[PubSub, None]:
+    async def psubscribe(self, *patterns: str) -> AsyncGenerator[PubSub, None]:
         """
         Subscribe to channels matching patterns.