feat: v2 — queue matchmaking, procedural audio, sprite archetypes, auth

- Add queue-based matchmaking with Elo-proximity and 10s timeout
- Procedural sound engine (SFX, voice announcer, 4-track music)
- Sprite system refactored into 6 archetypes (standard, lobster, sheep, cyborg, blob, tank)
- 42+ fight choreographies with themed/generic/wild card selection
- 4 KO finish styles, super-speed mode, hyperdetail close-ups
- Auth routes, JoinBout page, bot profile with stats
- 7-tier ranking system (Baby through Legend)
- Arena and challenge system expansions

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

frontend/src/router.ts

@@ -31,6 +31,11 @@ const routes = [
     name: 'register',
     component: () => import('./pages/RegisterPage.vue'),
   },
+  {
+    path: '/join',
+    name: 'join-bout',
+    component: () => import('./pages/JoinBoutPage.vue'),
+  },
   {
     path: '/schedule',
     name: 'schedule',