feat: production deployment — Dockerfile, docker-compose, SPA serving, classic bot fights

- Add Dockerfile (multi-stage: build frontend + server, serve from single container)
- Add docker-compose.yml for Portainer stack deployment
- Server serves frontend SPA in production (static assets + SPA fallback)
- Auto-run migrations and seed mock bots on server startup
- DB path configurable via DB_PATH env var
- Add "Fight a Classic Bot" button for instant mock bot matches
- FIGHT button queues for real AI opponents

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

server/src/index.ts

@@ -1,5 +1,11 @@
 import { serve } from '@hono/node-server'
 import { app } from './app.js'
+import { runMigrations } from './db/startup.js'
+import { seedMockBots } from './engine/mock.js'
+
+// Run migrations and seed mock bots before starting the server
+runMigrations()
+await seedMockBots()
 
 const port = Number(process.env.PORT) || 9100