feat: botfights v1 — full fighting game with Kaplay engine

- Vue 3 + Vite + Tailwind 4 frontend with synthwave aesthetic
- Hono backend on port 9100 with SQLite/Drizzle
- Procedural pixel-art sprite generator (48x48, 8 animation states)
- Kaplay fight scene with punch/kick/special/knockback/KO animations
- 12 mock bots across 6 tiers with Elo rating system
- 9 challenge types, 10 fight arenas with modifiers
- Fight replay with staggered battle log and ~1 min timing
- Sprite preview page at /sprites

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

frontend/src/main.ts

@@ -0,0 +1,8 @@
+import { createApp } from 'vue'
+import { router } from './router'
+import App from './App.vue'
+import './style.css'
+
+const app = createApp(App)
+app.use(router)
+app.mount('#app')