refactor: split openai/ into ollama/, openwebui/, searxng/

Move services out of the monolithic openai/docker-compose.yml:
- ollama/ — ollama GPU + CPU inference servers
- openwebui/ — open-webui chat UI (uses env var for ANTHROPIC_API_KEY)
- searxng/ — SearXNG container + searxng-mcp MCP server (port 3102)

openai/ now contains only: litellm, langfuse, qdrant, faster-whisper,
silero-tts, pipecat.

searxng-mcp exposes a single searxng_search tool via MCP HTTP on :3102.
Registered in ~/.claude.json as the "searxng" MCP server.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

openwebui/docker-compose.yml

@@ -0,0 +1,33 @@
+services:
+  open-webui:
+    image: ghcr.io/open-webui/open-webui:main
+    container_name: open-webui
+    ports:
+      - "3125:8080"
+    volumes:
+      - /mnt/ssd/ai/open-webui:/app/backend/data
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
+    restart: always
+    deploy:
+      resources:
+        reservations:
+          devices:
+            - driver: nvidia
+              count: all
+              capabilities: [gpu]
+    environment:
+      - ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY}
+      - OPENAI_API_BASE_URL=http://host.docker.internal:4000/v1
+      - OPENAI_API_KEY=dummy
+      # STT — Faster-Whisper large-v3-turbo
+      - AUDIO_STT_ENGINE=openai
+      - AUDIO_STT_OPENAI_API_BASE_URL=http://host.docker.internal:8880/v1
+      - AUDIO_STT_OPENAI_API_KEY=dummy
+      - AUDIO_STT_MODEL=deepdml/faster-whisper-large-v3-turbo-ct2
+      # TTS — Silero v4
+      - AUDIO_TTS_ENGINE=openai
+      - AUDIO_TTS_OPENAI_API_BASE_URL=http://host.docker.internal:8881/v1
+      - AUDIO_TTS_OPENAI_API_KEY=dummy
+      - AUDIO_TTS_MODEL=silero
+      - AUDIO_TTS_VOICE=onyx