Consolidate to single server with unified package.json

- Merge client and server dependencies into root package.json
- Remove separate client/package.json and server/package.json
- Update server/index.js to serve built client static files
- Simplify Dockerfile to single build + production stage
- Update dev scripts for unified development workflow
- SPA routing serves index.html for non-API routes

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

server/index.js

@@ -30,6 +30,21 @@ app.use(express.urlencoded({ extended: true, limit: '50mb' }));
 app.use('/uploads', express.static(uploadsDir));
 app.use('/exports', express.static(exportsDir));
 
+// Serve built client static files
+const clientDistDir = join(__dirname, 'dist');
+if (existsSync(clientDistDir)) {
+  app.use(express.static(clientDistDir));
+
+  // Serve index.html for all non-API routes (SPA routing)
+  app.get('*', (req, res, next) => {
+    if (!req.path.startsWith('/api') && !req.path.startsWith('/uploads') && !req.path.startsWith('/exports')) {
+      res.sendFile(join(clientDistDir, 'index.html'));
+    } else {
+      next();
+    }
+  });
+}
+
 // Configure multer for image uploads
 const storage = multer.diskStorage({
   destination: (req, file, cb) => {