Initial commit: ASCILINE YouTube Streamer

ASCII-art YouTube streaming for the Tesla in-car browser.

- FastAPI server on a Mac mini, no Docker.
- yt-dlp resolver: ID/URL/search.
- ffmpeg with -re -fps_mode cfr for source-paced video; trivial drain
  consumer.  Separate ffmpeg for AAC/ADTS audio.
- Vendored ASCILINE renderer (MIT) for the binary wire protocol; pure
  fillText color path, on-demand selection flush.
- HMAC PIN-gated cookie; Secure flag scheme-aware so /audio works on
  plain http during local dev.
- LOW preset (120x50 24fps) verified clean on M4: FPS 24/24, JIT ~42ms.

requirements.txt

@@ -0,0 +1,7 @@
+fastapi==0.111.0
+uvicorn[standard]==0.29.0
+opencv-python==4.9.0.80
+numpy==1.26.4
+websockets==12.0
+yt-dlp
+itsdangerous==2.2.0