feat: character system v2 — schema upgrade, memory system, per-character TTS routing

Character schema v2: background, dialogue_style, appearance, skills, gaze_presets
with automatic v1→v2 migration. LLM-assisted character creation via Character MCP
server. Two-tier memory system (personal per-character + general shared) with
budget-based injection into LLM system prompt. Per-character TTS voice routing via
state file — Wyoming TTS server reads active config to route between Kokoro (local)
and ElevenLabs (cloud PCM 24kHz). Dashboard: memories page, conversation history,
character profile on cards, auto-TTS engine selection from character config.
Also includes VTube Studio expression bridge and ComfyUI API guide.

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

homeai-dashboard/src/hooks/useTtsPlayback.js

@@ -1,7 +1,7 @@
 import { useState, useRef, useCallback } from 'react'
 import { synthesize } from '../lib/api'
 
-export function useTtsPlayback(voice) {
+export function useTtsPlayback(voice, engine = 'kokoro', model = null) {
   const [isPlaying, setIsPlaying] = useState(false)
   const audioCtxRef = useRef(null)
   const sourceRef = useRef(null)
@@ -23,7 +23,7 @@ export function useTtsPlayback(voice) {
 
     setIsPlaying(true)
     try {
-      const audioData = await synthesize(text, voice)
+      const audioData = await synthesize(text, voice, engine, model)
       const ctx = getAudioContext()
       if (ctx.state === 'suspended') await ctx.resume()
 
@@ -42,7 +42,7 @@ export function useTtsPlayback(voice) {
       console.error('TTS playback error:', err)
       setIsPlaying(false)
     }
-  }, [voice])
+  }, [voice, engine, model])
 
   const stop = useCallback(() => {
     if (sourceRef.current) {