feat(backend): subtask category support (schema, validation, sync, routes)

backend/src/routes/subtasks.ts

@@ -82,6 +82,7 @@ router.post('/task/:taskId', asyncHandler(async (req: Request, res: Response) =>
     userId,
     taskId: req.params.taskId,
     parentSubtaskId,
+    categoryId: data.categoryId ?? null,
     title: data.title,
     description: data.description ?? '',
     priority: data.priority ?? 'none',

backend/src/routes/sync.ts

@@ -235,6 +235,7 @@ router.post('/push', asyncHandler(async (req: Request, res: Response) => {
                 title: task.title,
                 description: task.description,
                 categoryId: task.categoryId,
+                tags: task.tags ?? '',
                 priority: task.priority,
                 completed: task.completed,
                 dueDate: task.dueDate,
@@ -290,6 +291,7 @@ router.post('/push', asyncHandler(async (req: Request, res: Response) => {
               .set({
                 taskId: sub.taskId,
                 parentSubtaskId: sub.parentSubtaskId ?? null,
+                categoryId: sub.categoryId ?? null,
                 title: sub.title,
                 description: sub.description ?? '',
                 priority: sub.priority ?? 'none',

backend/src/routes/tasks.ts

@@ -135,6 +135,7 @@ router.post('/', asyncHandler(async (req: Request, res: Response) => {
     id: taskId,
     userId,
     categoryId: data.categoryId,
+    tags: data.tags ?? '',
     title: data.title,
     description: data.description ?? '',
     priority: data.priority ?? 'none',
@@ -159,6 +160,7 @@ router.post('/', asyncHandler(async (req: Request, res: Response) => {
       userId,
       taskId,
       title: st.title,
+      categoryId: (st as any).categoryId ?? null,
       completed: false,
       order: index,
       createdAt: now,