fix(docker): in-container Gemini CLI OAuth, broadcast audio, ports + hardening

Makes the all-in-one image actually run the new real-time-search features and
closes review gaps:
- Gemini OAuth path: install Node 22 + @google/gemini-cli (pinned 0.46.0) in the
  image; mount a DEDICATED host dir (~/.config/javis/gemini) holding only the
  OAuth creds to /root/.gemini (not the whole ~/.gemini). Verified in-container:
  `gemini -p ... -o json` returns a grounded answer with no API key.
- Broadcast audio: add PulseAudio + a headless null-sink (run-pulse.sh, new
  supervisor program); export XDG_RUNTIME_DIR/PULSE_SERVER so Chrome playback
  and the selfbot `ffmpeg -f pulse -i @DEFAULT_MONITOR@` share one daemon.
  Verified: default sink virtual_speaker, monitor present, ffmpeg capture OK.
- Bind the brain bridge to 127.0.0.1 only (internal, unauthenticated API).
- VNC host port is overridable; this server pins VNC_PORT=5902 (.env) since the
  host already runs Xvnc on 5901.

Verified in-container with CDI GPU passthrough: RTX 5050 visible, NVENC
encoders (h264/hevc/av1) available.

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

docker-compose.yml

@@ -69,14 +69,26 @@ services:
     shm_size: "1gb"          # Chrome needs a larger /dev/shm
     ports:
       # Host ports are overridable. If the HOST already runs VNC on 5901
-      # (see docs/vnc-xfce-setup.md), set VNC_PORT=5902 in .env.
+      # (see docs/vnc-xfce-setup.md), set VNC_PORT=5902 in .env — this server
+      # does, so .env pins VNC_PORT=5902.
       - "${VNC_PORT:-5901}:5901"      # VNC
       - "${NOVNC_PORT:-6080}:6080"    # noVNC (open in a browser)
-      - "${BRIDGE_PORT:-8765}:8765"   # brain bridge (usually internal-only)
+      # Brain bridge: bind to loopback only — it is an internal bot<->brain API
+      # with no auth and must not be reachable off-host.
+      - "127.0.0.1:${BRIDGE_PORT:-8765}:8765"
     volumes:
       - javis_data:/data                         # jarvis db + memory
       - whisper_cache:/root/.cache/huggingface   # cached Whisper models
       - piper_voices:/opt/piper-voices           # TTS voices
+      # Gemini account login for GEMINI_AUTH=oauth real-time search. Mounts a
+      # DEDICATED dir holding only the Gemini OAuth creds (not the whole
+      # ~/.gemini), so the container can refresh its token without exposing
+      # unrelated host state. Seed it once with the host login:
+      #   mkdir -p ~/.config/javis/gemini
+      #   cp ~/.gemini/oauth_creds.json ~/.config/javis/gemini/
+      # Override GEMINI_OAUTH_DIR to point elsewhere. Only used when
+      # GEMINI_AUTH=oauth.
+      - ${GEMINI_OAUTH_DIR:-${HOME}/.config/javis/gemini}:/root/.gemini
 
 volumes:
   ollama_models: