feat: Matrix AI voice agent (LiveKit + LiteLLM)

Bot @ai:agiliton.eu accepts room invites, dispatches LiveKit agent.
Agent joins call with STT (Groq Whisper) → LLM (Sonnet) → TTS (ElevenLabs)
pipeline, all routed through LiteLLM.

CF-1147

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

docker-compose.yml

@@ -0,0 +1,13 @@
+services:
+  agent:
+    build: .
+    command: python agent.py start
+    env_file: .env
+    restart: unless-stopped
+    network_mode: host
+
+  bot:
+    build: .
+    command: python bot.py
+    env_file: .env
+    restart: unless-stopped