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>

server/src/index.ts

@@ -0,0 +1,8 @@
+import { serve } from '@hono/node-server'
+import { app } from './app.js'
+
+const port = Number(process.env.PORT) || 9100
+
+serve({ fetch: app.fetch, port }, () => {
+  console.log(`[botfights] server listening on http://localhost:${port}`)
+})