feat: implement PocketBase database schema setup script and core API service for content management

src/pages/Admin/index.jsx

@@ -104,7 +104,7 @@ const Admin = () => {
                         <div>
                           <p className="font-medium">{source.name}</p>
                           <p className="text-xs text-fg-muted flex items-center gap-1 mt-1">
-                            <Clock size={12} /> {new Date(source.created).toLocaleString()}
+                            <Clock size={12} /> {source.created ? new Date(source.created).toLocaleString() : '—'}
                           </p>
                         </div>
                       </div>