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>

searxng/mcp/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "searxng-mcp",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "server.js",
+  "dependencies": {
+    "@modelcontextprotocol/sdk": "^1.12.0",
+    "express": "^4.19.0",
+    "zod": "^3.23.0"
+  }
+}