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>

frontend/src/game/sounds.ts

@@ -335,11 +335,11 @@ const ROUND_HYPE = [
 
 // Mortal Kombat style dramatic calls
 export function announceFinishHim() {
-  speak('Finish him!', 'announcer', true, true)
+  speak('Finish it!', 'announcer', true, true)
 }
 
-export function announceFatality() {
-  speak('Fatality!', 'deep', true, true)
+export function announceFatality(tagline?: string) {
+  speak(tagline || 'Fatality!', 'deep', true, true)
 }
 
 export function announceFlawlessVictory() {