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/src/services/assessmentStatsService.ts

@@ -0,0 +1,42 @@
+import { apiClient } from './apiClient';
+
+export interface AssessmentStats {
+  totalAttempts: number;
+  highestScore: number;
+  averageScore: number;
+  completionRate: number;
+  recentRecords: {
+    id: string;
+    userId?: string;
+    knowledgeBase: string;
+    template: string;
+    score: number | null;
+    status: 'IN_PROGRESS' | 'COMPLETED';
+    createdAt: string;
+    user?: { id: string };
+  }[];
+}
+
+export interface StatsQueryParams {
+  startDate?: string;
+  endDate?: string;
+  templateId?: string;
+  knowledgeGroupId?: string;
+}
+
+export class AssessmentStatsService {
+  async getStats(params?: StatsQueryParams): Promise<AssessmentStats> {
+    const query = new URLSearchParams();
+    if (params?.startDate) query.set('startDate', params.startDate);
+    if (params?.endDate) query.set('endDate', params.endDate);
+    if (params?.templateId) query.set('templateId', params.templateId);
+    if (params?.knowledgeGroupId) query.set('knowledgeGroupId', params.knowledgeGroupId);
+
+    const queryString = query.toString();
+    const url = `/assessment/stats${queryString ? `?${queryString}` : ''}`;
+    const { data } = await apiClient.get<AssessmentStats>(url);
+    return data;
+  }
+}
+
+export const assessmentStatsService = new AssessmentStatsService();