refactor(safety): apply consistent formatting across services and tests

Improved code readability and uniformity by standardizing line breaks, indentation, and inline conditions across safety-related services, models, and tests, including content filters, validation rules, and emergency controls.

backend/app/services/safety/rollback/manager.py

@@ -66,9 +66,7 @@ class RollbackManager:
         """
         config = get_safety_config()
 
-        self._checkpoint_dir = Path(
-            checkpoint_dir or config.checkpoint_dir
-        )
+        self._checkpoint_dir = Path(checkpoint_dir or config.checkpoint_dir)
         self._retention_hours = retention_hours or config.checkpoint_retention_hours
 
         self._checkpoints: dict[str, Checkpoint] = {}
@@ -231,7 +229,9 @@ class RollbackManager:
             success=success,
             actions_rolled_back=actions_rolled_back,
             failed_actions=failed_actions,
-            error=None if success else f"Failed to rollback {len(failed_actions)} items",
+            error=None
+            if success
+            else f"Failed to rollback {len(failed_actions)} items",
         )
 
         if success:
@@ -294,8 +294,7 @@ class RollbackManager:
 
         if not include_expired:
             checkpoints = [
-                c for c in checkpoints
-                if c.expires_at is None or c.expires_at > now
+                c for c in checkpoints if c.expires_at is None or c.expires_at > now
             ]
 
         return checkpoints