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

server/test_db.py

@@ -0,0 +1,26 @@
+import sqlite3
+import os
+
+db_path = 'd:/workspace/AuraK/server/database.sqlite'
+if not os.path.exists(db_path):
+    print("DB not found")
+    exit(1)
+
+conn = sqlite3.connect(db_path)
+c = conn.cursor()
+
+print("--- knowledge_group ---")
+try:
+    for row in c.execute('SELECT id, name, tenantId from knowledge_group'):
+        print(row)
+except Exception as e:
+    print(e)
+    
+print("\n--- import_task ---")
+try:
+    for row in c.execute('SELECT id, targetGroupId, targetGroupName, status from import_task'):
+        print(row)
+except Exception as e:
+    print(e)
+
+conn.close()