feat: add native Windows broadcaster and live score modules

- streamer/windows: vash-broadcast.exe (setup/login/start/stop/status/doctor)
  with per-instance OBS, tosu and FFmpeg, a supervised worker, OCR room
  selection and OBS scene reconciliation; built and tested on Linux only
- streamer/relay.ts shared with Vash TV; Cloudflare Access proxy for dev/staging
- worker status validation and live score helpers for the site
- STREAMING_HANDOFF.md and streamer/ALPHA_TEST.md record what is unverified

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

streamer/tsconfig.json

@@ -8,5 +8,5 @@
 		"noEmit": true,
 		"types": ["bun"]
 	},
-	"include": ["*.ts", "tv/*.ts"]
+	"include": ["*.ts", "tv/*.ts", "windows/*.ts"]
 }