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/index.css

@@ -0,0 +1,8 @@
+@import "tailwindcss";
+@plugin "@tailwindcss/typography";
+
+@layer base {
+    body {
+        @apply bg-[#FCFDFF] text-slate-800 antialiased;
+    }
+}