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>

Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
       xfce4 xfce4-goodies dbus-x11 x11-utils xfonts-base \
       fonts-noto-cjk fonts-noto-cjk-extra fonts-nanum \
       ffmpeg tesseract-ocr \
+      pulseaudio pulseaudio-utils \
       python3 python3-venv python3-pip \
       novnc websockify supervisor gettext-base \
     && rm -rf /var/lib/apt/lists/*
@@ -31,6 +32,17 @@ RUN wget -q -O /tmp/chrome.deb https://dl.google.com/linux/direct/google-chrome-
 # --- bun (Discord bot runtime/package manager) ---
 RUN curl -fsSL https://bun.sh/install | bash
 
+# --- Node.js + Gemini CLI (the GEMINI_AUTH=oauth real-time search path shells
+#     out to `gemini`; it needs a real Node runtime, not bun). The account
+#     login itself is provided at runtime via the mounted ~/.gemini (see
+#     docker-compose.yml); here we only install the binary. ---
+ARG GEMINI_CLI_VERSION=0.46.0
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && npm install -g "@google/gemini-cli@${GEMINI_CLI_VERSION}" \
+    && rm -rf /var/lib/apt/lists/* \
+    && gemini --version
+
 # --- Python brain/bridge deps (slim set) ---
 COPY bridge/requirements-bridge.txt /app/bridge/requirements-bridge.txt
 RUN python3 -m venv /opt/venv \