feat: add test endpoint to trip service

trip-service/server.js

@@ -165,6 +165,21 @@ app.get('/trips', (req, res) => {
   res.json(loadTrips());
 });
 
+app.post('/trips/:id/test', async (req, res) => {
+  const trips = loadTrips();
+  const trip = trips.find(t => t.id === req.params.id);
+  if (!trip) return res.status(404).json({ error: 'Trip not found' });
+  
+  // Just use the first day's plan for the test
+  const dayPlan = trip.days[0];
+  try {
+    await generateAndSendBriefing(trip, dayPlan);
+    res.json({ success: true, message: 'Test briefing sent!' });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
 app.get('/health', (req, res) => res.json({ status: 'ok' }));
 
 // ── Scheduler (Runs every minute, checks if time to send) ────────────────────