feat: bake Matrix bridge deps into Docker image instead of volume mount

- Add libolm-dev system dep (required by mautrix[encryption])
- Add mautrix[encryption] + openai pip packages to build
- These were previously installed inline at container startup and
  persisted via the fragile venv volume mount (now removed)

ai/hermes/Dockerfile

@@ -34,6 +34,7 @@ USER root
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         libportaudio2 ca-certificates poppler-utils imagemagick \
+        libolm-dev \
         texlive-latex-base texlive-latex-extra texlive-fonts-recommended \
         texlive-xetex texlive-science \
         qemu-user-static binfmt-support emacs-nox && \
@@ -42,6 +43,12 @@ RUN apt-get update && \
 # ---------- UV ----------
 COPY --chmod=0755 --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/
 
+# ---------- Matrix bridge + extra pip deps ----------
+# Previously installed inline at container startup and persisted via volume mount.
+# Now baked into the image so the fragile venv volume mount can be removed.
+RUN . /opt/hermes/.venv/bin/activate && \
+    uv pip install --no-cache-dir 'mautrix[encryption]' openai
+
 # ---------- Piper TTS ----------
 RUN . /opt/hermes/.venv/bin/activate && \
     uv pip install --no-cache-dir piper-tts sounddevice numpy && \