refactor: remove db.commit() from business services, callers use UnitOfWork (Tier 3)

backend/app/routers/worklogs.py

@@ -10,6 +10,7 @@ from sqlalchemy.orm import Session
 
 from app.database import get_db
 from app.dependencies.auth import get_current_user, require_any_role
+from app.domain.unit_of_work import UnitOfWork
 from app.models.user import User
 from app.services import worklog_service
 
@@ -57,17 +58,20 @@ def create(
     user: User = Depends(require_any_role("red_tech", "blue_tech", "red_lead", "blue_lead")),
 ):
     """Create a manually-logged worklog entry."""
-    wl = worklog_service.create_worklog(
-        db,
-        entity_type=body.entity_type,
-        entity_id=body.entity_id,
-        user_id=user.id,
-        activity_type=body.activity_type,
-        started_at=body.started_at,
-        ended_at=body.ended_at,
-        duration_seconds=body.duration_seconds,
-        description=body.description,
-    )
+    with UnitOfWork(db) as uow:
+        wl = worklog_service.create_worklog(
+            db,
+            entity_type=body.entity_type,
+            entity_id=body.entity_id,
+            user_id=user.id,
+            activity_type=body.activity_type,
+            started_at=body.started_at,
+            ended_at=body.ended_at,
+            duration_seconds=body.duration_seconds,
+            description=body.description,
+        )
+        uow.commit()
+    db.refresh(wl)
     return wl