build(docker): GPU-ready test image for .9 (CUDA 12.4 + py3.11 + node22/ffmpeg)

Bundles the M1 milestone: mock voice pipeline (wsai) + dave/ selfbot voice
joiner. Entrypoint dispatches smoke/voice/mock/gpu/join/shell. .env mounted at
runtime (not baked). Built GPU-capable via NVIDIA CDI so later STT/TTS drop in.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docker-entrypoint.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Test/run dispatcher for the watch_sceen_ai container.
+#
+#   smoke  (default)  pytest smoke suite (mock pipeline, no deps, no GPU)
+#   voice             python -m wsai --voice  (eyes-free mock voice loop demo)
+#   mock              python -m wsai          (full mock flow, few frames)
+#   gpu               nvidia-smi — prove the GPU is visible inside the container
+#   join              node dave/join.mjs — LIVE selfbot voice join (needs .env
+#                     mounted; honors RUN_MS / GUILD_ID / CHANNEL_ID / SELF_ID)
+#   shell             drop to bash
+set -euo pipefail
+cd /app
+
+cmd="${1:-smoke}"; shift || true
+
+case "$cmd" in
+  smoke)  exec python -m pytest -q ;;
+  voice)  exec python -m wsai --voice ;;
+  mock)   exec python -m wsai ;;
+  gpu)    exec nvidia-smi ;;
+  join)   cd dave && exec node join.mjs ;;
+  shell)  exec bash ;;
+  *)      exec "$cmd" "$@" ;;
+esac