feat: add self-hosted memory providers (OpenViking, Honcho, Holographic)

- Add OpenViking service (knowledge graph) using official GHCR image
- Add Honcho stack (user modeling): API + PostgreSQL pgvector + Redis
- Add Holographic config to Hermes (local SQLite, no server needed)
- Hermes: install httpx for OpenViking client
- Hermes: auto-generate config.yaml + honcho.json on first boot
- All data 100% local, zero cloud dependencies

ai/hermes/Dockerfile

@@ -49,6 +49,14 @@ COPY --chmod=0755 --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/
 RUN . /opt/hermes/.venv/bin/activate && \
     uv pip install --no-cache-dir 'mautrix[encryption]' openai
 
+WORKDIR /opt/hermes
+
+# ---------- Memory provider dependencies ----------
+# httpx: HTTP client for OpenViking plugin
+# honcho-ai: already installed in upstream image (v2.1.1+)
+RUN . /opt/hermes/.venv/bin/activate && \
+    uv pip install --no-cache-dir httpx
+
 # ---------- Piper TTS ----------
 RUN . /opt/hermes/.venv/bin/activate && \
     uv pip install --no-cache-dir piper-tts sounddevice numpy && \