refactor: eliminate any types across server and TTS worker

- app.ts: type serveFile context parameter as Hono Context
- bets.ts: replace catch(err: any) with err: unknown + narrowing
- fight-loop.ts: type pickMatchup style as union literal, replace
  as any casts with proper result type
- tts-worker.ts: import KokoroTTS type, use ProgressInfo inference

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

server/src/app.ts

@@ -1,4 +1,4 @@
-import { Hono } from 'hono'
+import { Hono, type Context } from 'hono'
 import { cors } from 'hono/cors'
 import { logger } from 'hono/logger'
 import { secureHeaders } from 'hono/secure-headers'
@@ -79,7 +79,7 @@ if (process.env.NODE_ENV === 'production' && existsSync(publicDir)) {
     webmanifest: 'application/manifest+json',
   }
 
-  function serveFile(c: any, reqPath: string, cacheControl: string) {
+  function serveFile(c: Context, reqPath: string, cacheControl: string) {
     const resolved = join(publicDir, reqPath)
     // Prevent path traversal
     if (!resolved.startsWith(publicDir)) return c.notFound()