refactor: remove db.commit() from audit_service.log_action, all callers use UoW

backend/app/routers/snapshots.py

@@ -68,14 +68,16 @@ def create_snapshot_endpoint(
     """Create a manual coverage snapshot with an optional name."""
     snapshot = create_snapshot(db, name=payload.name, user_id=current_user.id)
 
-    log_action(
-        db,
-        user_id=current_user.id,
-        action="create_snapshot",
-        entity_type="snapshot",
-        entity_id=snapshot.id,
-        details={"name": snapshot.name, "score": snapshot.organization_score},
-    )
+    with UnitOfWork(db) as uow:
+        log_action(
+            db,
+            user_id=current_user.id,
+            action="create_snapshot",
+            entity_type="snapshot",
+            entity_id=snapshot.id,
+            details={"name": snapshot.name, "score": snapshot.organization_score},
+        )
+        uow.commit()
 
     return serialize_snapshot_summary(snapshot)
 
@@ -128,16 +130,15 @@ def delete_snapshot_endpoint(
     """Delete a snapshot (admin only)."""
     snapshot = get_snapshot_or_raise(db, snapshot_id)
 
-    log_action(
-        db,
-        user_id=current_user.id,
-        action="delete_snapshot",
-        entity_type="snapshot",
-        entity_id=snapshot.id,
-        details={"name": snapshot.name},
-    )
-
     with UnitOfWork(db) as uow:
+        log_action(
+            db,
+            user_id=current_user.id,
+            action="delete_snapshot",
+            entity_type="snapshot",
+            entity_id=snapshot.id,
+            details={"name": snapshot.name},
+        )
         delete_snapshot(db, snapshot_id)
         uow.commit()