refactor: 使用 @picovoice/web-voice-processor 替换手写音频采集管线

- 引入 WebVoiceProcessor 处理 getUserMedia、AudioContext 生命周期和 WASM 重采样
- 删除自定义 AudioWorklet (audio-processor.ts) 和线性插值重采样器 (resample.ts)
- 改善音频采集稳定性：自动检测 AudioContext suspended/closed 状态并重建
- 更精确的错误提示：区分权限拒绝、设备未找到、设备异常

web/package.json

@@ -22,6 +22,7 @@
 		"vite-plugin-pwa": "^1.2.0"
 	},
 	"dependencies": {
+		"@picovoice/web-voice-processor": "^4.0.9",
 		"partysocket": "^1.1.16",
 		"react": "^19.2.4",
 		"react-dom": "^19.2.4",