feat: VoiceCoach v2 — livekit-agents 1.5 personal voice assistant

Replaces pipecat 0.0.48 (6 manual patches, DuplicateIdentity reconnect storms)
with livekit-agents 1.5 SDK. New features:
- SvelteKit UI with live transcript, VAD ring, mode bar, vocal meter, history view
- SQLite session store with WAL mode (cross-session memory)
- Async SpeechBrain vocal/emotion analysis injected per turn
- Homelab tools: SSH/docker, Prometheus alerts, Home Assistant, SearXNG search
- OpenClaw LLM gateway preserved (qwen2.5:14b via Ollama)
- 4 modes: coaching, vent, practice, briefing

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

compose/hf-pdocker-01/voicecoach-v2/livekit/livekit.yaml

@@ -0,0 +1,15 @@
+port: 7880
+rtc:
+  tcp_port: 7881
+  port_range_start: 50000
+  port_range_end: 50100
+  use_external_ip: true
+
+logging:
+  json: false
+  level: info
+
+room:
+  max_participants: 5
+  empty_timeout: 300
+  departure_timeout: 30