fix: report Faro app name as dancefinder-app

The Faro app name was copied from Shiny ("Shiny Frontend"), mixing Dancefinder browser telemetry with Shiny's in VictoriaLogs/VictoriaTraces.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VSC7dLAgao1afzL5DQfH8F

app/plugins/01.grafana.ts

@@ -9,7 +9,7 @@ export default defineNuxtPlugin((nuxtApp) => {
   if (config.grafanaUrl) {
     const faro = initializeFaro({
       app: {
-        name: 'Shiny Frontend',
+        name: 'dancefinder-app',
         version: '1.0.0',
         environment: config.name,
       },