feat: implement QuestionBank CRUD with pagination and template query

- Add pagination support to findAll (page, limit query params)
- Add findByTemplateId method to service
- Add GET /by-template/:templateId endpoint to controller
- Service already includes CRUD for QuestionBank and QuestionBankItem

web/services/noteCategoryService.ts

@@ -0,0 +1,45 @@
+import { API_BASE_URL, NoteCategory } from '../types';
+
+export const noteCategoryService = {
+    async getAll(token: string): Promise<NoteCategory[]> {
+        const res = await fetch(`${API_BASE_URL}/v1/note-categories`, {
+            headers: { 'Authorization': `Bearer ${token}` }
+        });
+        if (!res.ok) throw new Error('Failed to fetch categories');
+        return res.json();
+    },
+
+    async create(token: string, name: string, parentId?: string): Promise<NoteCategory> {
+        const response = await fetch(`${API_BASE_URL}/v1/note-categories`, {
+            method: 'POST',
+            headers: {
+                'Authorization': `Bearer ${token}`,
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ name, parentId })
+        })
+        if (!response.ok) throw new Error('Failed to create category')
+        return response.json()
+    },
+
+    async update(token: string, id: string, name?: string, parentId?: string): Promise<NoteCategory> {
+        const response = await fetch(`${API_BASE_URL}/v1/note-categories/${id}`, {
+            method: 'PUT',
+            headers: {
+                'Authorization': `Bearer ${token}`,
+                'Content-Type': 'application/json'
+            },
+            body: JSON.stringify({ name, parentId })
+        })
+        if (!response.ok) throw new Error('Failed to update category')
+        return response.json()
+    },
+
+    async delete(token: string, id: string): Promise<void> {
+        const res = await fetch(`${API_BASE_URL}/v1/note-categories/${id}`, {
+            method: 'DELETE',
+            headers: { 'Authorization': `Bearer ${token}` }
+        });
+        if (!res.ok) throw new Error('Failed to delete category');
+    }
+};