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/api/routes/issues.py

@@ -278,9 +278,7 @@ async def list_issues(
     assigned_agent_id: UUID | None = Query(
         None, description="Filter by assigned agent ID"
     ),
-    sync_status: SyncStatus | None = Query(
-        None, description="Filter by sync status"
-    ),
+    sync_status: SyncStatus | None = Query(None, description="Filter by sync status"),
     search: str | None = Query(
         None, min_length=1, max_length=100, description="Search in title and body"
     ),
@@ -783,9 +781,7 @@ async def assign_issue(
         updated_issue = await issue_crud.assign_to_agent(
             db, issue_id=issue_id, agent_id=None
         )
-        logger.info(
-            f"User {current_user.email} unassigned issue {issue_id}"
-        )
+        logger.info(f"User {current_user.email} unassigned issue {issue_id}")
 
     if not updated_issue:
         raise NotFoundError(