fix: regex catch-all route + HTTPS img CSP for map tiles

backend/src/app.js

@@ -91,7 +91,7 @@ app.use('/api/v1/preferences', preferencesRoutes);
 const frontendDist = existsSync('../frontend/dist') ? '../frontend/dist' : 'frontend/dist';
 if (config.NODE_ENV === 'production') {
   app.use(express.static(frontendDist));
-  app.get('*', (_req, res) => {
+  app.get(/.*/, (_req, res) => {
     res.sendFile('index.html', { root: frontendDist });
   });
 }