feat: v4 — TUI fight loop, rate limiting, webhook tooling, expanded choreographies

- Fight loop CLI with TUI renderer (ink-style terminal UI)
- Rate limiting middleware for API routes
- Queue cooldowns wired into orchestrator after fights
- Webhook test utility for bot debugging
- API docs route
- Expanded FightScene choreographies and weapon props
- Fix Drizzle transaction execution in orchestrator
- Schema additions, scoring/challenge/mock expansions

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

frontend/src/components/FightViewer.vue

@@ -84,11 +84,14 @@ function mapHp(hp: number, winnerId: string | null, botId: string | undefined):
   return Math.round((hp / 200) * 100)
 }
 
-onUnmounted(() => { scene?.destroy(); scene = null })
+onUnmounted(() => {
+  if (scene) { scene.destroy(); scene = null }
+})
 
 async function initScene() {
   if (!canvasRef.value || !props.fight.botA || !props.fight.botB) return
-  if (scene) { scene.k.go('fight'); return }
+  // Destroy previous scene to avoid "KAPLAY already initialized" warning
+  if (scene) { scene.destroy(); scene = null }
 
   const container = canvasRef.value.parentElement
   if (container) {