Add shot/asset typing and owned task types to departments

Departments now carry a type (shot or asset) and own a list of task
types (e.g. Animation: blocking/primary_pass/second_pass, Composite:
first_pass/second_pass, plus a new Simulation department), additive to
the existing flat Custom Task Type system. When a task's type belongs
to a department, its department is derived and kept in sync server-side
across create/update paths; Task Type is now editable in the Task
Detail panel and Department options are filtered to the task's
shot/asset scope.

backend/routers/tasks.py

@@ -25,6 +25,7 @@ from schemas.task import (
 from utils.auth import get_current_user_from_token, _get_user_from_db, require_role, require_permission, user_has_permission
 from utils.notifications import notification_service
 from utils.file_handler import file_handler
+from utils.departments import find_owning_department
 
 router = APIRouter()
 
@@ -415,10 +416,16 @@ async def create_task(
         # Validate the provided status
         if not validate_task_status(db, task.project_id, task_data['status']):
             raise HTTPException(
-                status_code=400, 
+                status_code=400,
                 detail=f"Invalid status '{task_data['status']}' for this project"
             )
-    
+
+    # If the task type belongs to a department, that department wins over
+    # anything explicitly submitted for `department`.
+    owning_department = find_owning_department(project, task_data.get('task_type'))
+    if owning_department:
+        task_data['department'] = owning_department
+
     # Create task
     db_task = Task(**task_data)
     db.add(db_task)
@@ -829,7 +836,15 @@ async def update_task(
                 status_code=400,
                 detail=f"Invalid status '{update_data['status']}' for this project"
             )
-    
+
+    # If the task type is being changed to one owned by a department, that
+    # department wins over anything explicitly submitted for `department`.
+    if 'task_type' in update_data:
+        project = db.query(Project).filter(Project.id == task.project_id).first()
+        owning_department = find_owning_department(project, update_data['task_type'])
+        if owning_department:
+            update_data['department'] = owning_department
+
     # Update task
     for field, value in update_data.items():
         setattr(task, field, value)