fix: handle missing ffmpeg on windows and add devices alias

src/services/elevenlabs-tts.ts

@@ -1,9 +1,9 @@
 import { Readable } from "node:stream";
 
-import ffmpegStatic from "ffmpeg-static";
 import prism from "prism-media";
 
 import type { AssistantRuntimeConfig } from "../config.js";
+import { resolveFfmpegPath } from "../audio/ffmpeg-path.js";
 
 export interface PreparedSpeechAudio {
   stream: Readable;
@@ -12,7 +12,7 @@ export interface PreparedSpeechAudio {
 
 export class ElevenLabsTtsService {
   constructor(private readonly config: AssistantRuntimeConfig) {
-    const resolvedFfmpegPath = ffmpegStatic as unknown as string | null;
+    const resolvedFfmpegPath = resolveFfmpegPath();
     if (resolvedFfmpegPath && !process.env.FFMPEG_PATH) {
       process.env.FFMPEG_PATH = resolvedFfmpegPath;
     }