feat: implement dynamic training course tab system and modular PDF data migration scripts

sisvietnamvn_main/append_css.py

@@ -0,0 +1,23 @@
+with open('src/main/resources/static/css/custom.css', 'a') as f:
+    f.write('''
+
+/* CSS cho Tab Đa năng */
+.custom-tab-btn {
+    padding: 10px 20px;
+    border: 1px solid #ccc;
+    background-color: #f8f9fa;
+    color: black;
+    cursor: pointer;
+    transition: all 0.2s ease-in-out;
+}
+
+.custom-tab-btn:hover {
+    background-color: #e9ecef;
+}
+
+.custom-tab-btn.active {
+    background-color: #0055a5;
+    color: white;
+    border-color: #0055a5;
+}
+''')