feat(frontend): implement dashboard page

- Create DashboardPage with active events, matches, and requests
- Add dashboardAPI.getData() to services/api.js
- Add /dashboard route as default landing after login
- Update Navbar with Dashboard and Events links
- Show video exchange and rating status for matches
- Handle match accept/reject/cancel actions

frontend/src/services/api.js

@@ -371,4 +371,12 @@ export const ratingsAPI = {
   },
 };
 
+// Dashboard API
+export const dashboardAPI = {
+  async getData() {
+    const data = await fetchAPI('/dashboard');
+    return data.data;
+  },
+};
+
 export { ApiError };