chore: add Dockerfile and docker-compose with static file serving

Multi-stage Docker build (web → server → production). Fastify serves
React build in production with SPA fallback. Docker Compose with volume
for SQLite persistence.

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

server/src/index.ts

@@ -1,7 +1,10 @@
 import { createServer } from 'node:http';
+import { join } from 'node:path';
+import { existsSync } from 'node:fs';
 import Fastify from 'fastify';
 import cors from '@fastify/cors';
-import { PORT } from './config.js';
+import fastifyStatic from '@fastify/static';
+import { PORT, NODE_ENV } from './config.js';
 import { runMigrations } from './db/migrate.js';
 import { healthRoutes } from './routes/health.js';
 import { shipRoutes } from './routes/ships.js';
@@ -27,8 +30,26 @@ const start = async () => {
     await app.register(shipRoutes);
     await app.register(weaponRoutes);
 
+    // In production, serve the React build as static files
+    const webDistPath = join(process.cwd(), 'web-dist');
+    if (NODE_ENV === 'production' && existsSync(webDistPath)) {
+      await app.register(fastifyStatic, {
+        root: webDistPath,
+        prefix: '/',
+        wildcard: false,
+      });
+
+      // SPA fallback: non-API GET requests return index.html
+      app.setNotFoundHandler((request, reply) => {
+        if (request.method === 'GET' && !request.url.startsWith('/api')) {
+          return reply.sendFile('index.html');
+        }
+        reply.code(404).send({ error: 'Not found' });
+      });
+    }
+
     await app.listen({ port: PORT, host: '0.0.0.0' });
-    console.log(`Server running on port ${PORT}`);
+    console.log(`Server running on port ${PORT} (${NODE_ENV})`);
   } catch (err) {
     app.log.error(err);
     process.exit(1);