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/utils/clipboard.ts

@@ -0,0 +1,39 @@
+/**
+ * Handles copying text to the clipboard with a fallback for insecure contexts.
+ * In non-HTTPS/non-localhost environments, navigator.clipboard is not available.
+ */
+export const copyToClipboard = async (text: string): Promise<boolean> => {
+    // 1. Try modern Clipboard API first (requires secure context)
+    if (navigator.clipboard && window.isSecureContext) {
+        try {
+            await navigator.clipboard.writeText(text);
+            return true;
+        } catch (err) {
+            console.error('Clipboard API failed:', err);
+            // Fall through to fallback
+        }
+    }
+
+    // 2. Fallback: document.execCommand('copy')
+    try {
+        const textArea = document.createElement('textarea');
+        textArea.value = text;
+
+        // Ensure the textarea is not visible but stays in the DOM
+        textArea.style.position = 'fixed';
+        textArea.style.left = '-9999px';
+        textArea.style.top = '0';
+        document.body.appendChild(textArea);
+
+        textArea.focus();
+        textArea.select();
+
+        const successful = document.execCommand('copy');
+        document.body.removeChild(textArea);
+
+        return successful;
+    } catch (err) {
+        console.error('Fallback copy failed:', err);
+        return false;
+    }
+};