fix: serve React frontend and fix docker healthcheck

- Add express.static + SPA fallback in server so the React build
  is served at the root path
- Replace wget healthcheck with node http call since wget is not
  available in node:20-slim

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Syntax-Error-1337

docker-compose.yml

@@ -31,7 +31,7 @@ services:
     restart: unless-stopped
 
     healthcheck:
-      test: ["CMD", "wget", "--quiet", "--tries=1", "--spider", "http://localhost:3001/health"]
+      test: ["CMD", "node", "-e", "require('http').get('http://localhost:3001/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))"]
       interval: 30s
       timeout: 10s
       retries: 3

server/src/index.ts

@@ -1,5 +1,6 @@
 import express from 'express';
 import cors from 'cors';
+import path from 'path';
 import 'dotenv/config';
 import flightsRouter from './routes/flights';
 import maritimeRouter from './routes/maritime';
@@ -23,6 +24,11 @@ app.use('/api/cyber', cyberRouter);
 
 app.get('/health', (req, res) => res.json({ status: 'ok' }));
 
+// Serve React frontend
+const publicDir = path.join(__dirname, '..', 'public');
+app.use(express.static(publicDir));
+app.get('*', (_req, res) => res.sendFile(path.join(publicDir, 'index.html')));
+
 const server = app.listen(PORT, async () => {
   console.log(`Server intel-proxy listening on port ${PORT}`);