feat(voice): push-to-talk button — браузерный mic+VAD pipeline

Шаг 2 миграции: убираем зависимость от Python-агента для базового
голосового сценария. Тап на круглую кнопку-микрофон в правом нижнем
углу → MicVAD (Silero v5) ловит речь → автостоп по тишине → /api/voice/stt
→ /api/voice/chat → ответ через SSE и TTS как раньше.

- components/VoiceController.tsx — push-to-talk UI + MicVAD orchestration
- VoiceOverlay теперь слушает window CustomEvent('voice-local'), чтобы
  орб моргал ещё до round-trip на сервер (wake/listening мгновенно).
- public/vad/ — silero v5/legacy onnx + ort wasm + audio worklet,
  раздаются через baseAssetPath: '/vad/' (не зависит от внешнего CDN,
  важно если планшет без интернета или с RU-блоком).

Что осталось от home-voice-assistant: только wake-word. После Шага 3
(onnxruntime-web + перенос openwakeword .onnx) Python-агент уйдёт целиком.

package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "dependencies": {
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@@ -16,6 +17,7 @@
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         "next": "14.2.3",
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         "react": "^18",
         "react-dom": "^18",
         "undici": "^7.16.0"
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+      "resolved": "https://registry.npmjs.org/@ricky0123/vad-web/-/vad-web-0.0.30.tgz",
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+      "license": "ISC",
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@@ -964,6 +1039,12 @@
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+    "node_modules/guid-typescript": {
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+      "resolved": "https://registry.npmjs.org/guid-typescript/-/guid-typescript-1.0.9.tgz",
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@@ -1488,6 +1575,12 @@
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@@ -1780,6 +1873,26 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/onnxruntime-common": {
+      "version": "1.24.3",
+      "resolved": "https://registry.npmjs.org/onnxruntime-common/-/onnxruntime-common-1.24.3.tgz",
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+      "license": "MIT"
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+    "node_modules/onnxruntime-web": {
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+      "resolved": "https://registry.npmjs.org/onnxruntime-web/-/onnxruntime-web-1.24.3.tgz",
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+        "guid-typescript": "^1.0.9",
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@@ -1826,6 +1939,12 @@
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@@ -1989,6 +2108,30 @@
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