feat: Add /push/request-location endpoint for manual location pings

- POST /push/request-location with { roomSlug } triggers silent push
- Returns count of sent/failed notifications
- Useful for on-demand location refresh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

sync-server/server.js

@@ -469,6 +469,60 @@ const server = createServer(async (req, res) => {
       res.writeHead(500, { 'Content-Type': 'application/json' });
       res.end(JSON.stringify({ error: 'Failed to send test' }));
     }
+  } else if (pathname === '/push/request-location' && req.method === 'POST') {
+    // Manually trigger location request for a room
+    try {
+      const { roomSlug } = await parseJsonBody(req);
+
+      if (!roomSlug) {
+        res.writeHead(400, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ error: 'roomSlug required' }));
+        return;
+      }
+
+      const subs = pushSubscriptions.get(roomSlug);
+      if (!subs || subs.size === 0) {
+        res.writeHead(200, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ success: true, sent: 0, message: 'No subscribers in room' }));
+        return;
+      }
+
+      let sent = 0;
+      let failed = 0;
+      const failedEndpoints = [];
+
+      for (const sub of subs) {
+        try {
+          await webpush.sendNotification(sub, JSON.stringify({
+            silent: true,
+            data: { type: 'location_request', roomSlug }
+          }));
+          sent++;
+        } catch (error) {
+          failed++;
+          if (error.statusCode === 404 || error.statusCode === 410) {
+            failedEndpoints.push(sub.endpoint);
+          }
+        }
+      }
+
+      // Clean up failed subscriptions
+      for (const endpoint of failedEndpoints) {
+        for (const sub of subs) {
+          if (sub.endpoint === endpoint) {
+            subs.delete(sub);
+          }
+        }
+      }
+
+      console.log(`[${roomSlug}] Manual location request: ${sent} sent, ${failed} failed`);
+      res.writeHead(200, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ success: true, sent, failed }));
+    } catch (error) {
+      console.error('Location request error:', error);
+      res.writeHead(500, { 'Content-Type': 'application/json' });
+      res.end(JSON.stringify({ error: 'Failed to request location' }));
+    }
   } else {
     res.writeHead(404);
     res.end('Not found');