fix: resolve TS error in fal-audio, widen music regex and fal method routing

- Fix fal-audio.ts TS2339: use already-narrowed contentType variable
  instead of re-accessing response.audio.contentType in ext derivation
- Widen ELEVENLABS_MUSIC_RE to match /v1/music and /v1/music/{subType}
  (was restricted to generation|variation|remix|extend only)
- Default musicSubType to "music" when regex capture group is empty
- Add PUT method to fal queue requests route for cancel support

Author: jpr5

src/fal-audio.ts

@@ -94,10 +94,8 @@ function audioToFalFile(response: AudioResponse): Record<string, unknown> {
 
   const ext =
     response.format ??
-    (typeof response.audio !== "string" && response.audio.contentType
-      ? (Object.entries(FORMAT_TO_CONTENT_TYPE).find(
-          ([, v]) => v === response.audio.contentType,
-        )?.[0] ?? "mp3")
+    (contentType !== "audio/mpeg"
+      ? (Object.entries(FORMAT_TO_CONTENT_TYPE).find(([, v]) => v === contentType)?.[0] ?? "mp3")
       : "mp3");
 
   const fileSize =

src/server.ts

@@ -81,7 +81,7 @@ const VIDEOS_PATH = "/v1/videos";
 const VIDEOS_STATUS_RE = /^\/v1\/videos\/([^/]+)$/;
 const GEMINI_PREDICT_RE = /^\/v1beta\/models\/([^:]+):predict$/;
 const ELEVENLABS_SOUND_GENERATION_PATH = "/v1/sound-generation";
-const ELEVENLABS_MUSIC_RE = /^\/v1\/music\/(generation|variation|remix|extend)$/;
+const ELEVENLABS_MUSIC_RE = /^\/v1\/music(?:\/(.+))?$/;
 const FAL_QUEUE_SUBMIT_RE = /^\/fal\/queue\/submit\/(.+)$/;
 const FAL_QUEUE_REQUESTS_RE = /^\/fal\/queue\/requests\/(.+)$/;
 const FAL_RUN_RE = /^\/fal\/run\/(.+)$/;
@@ -1645,7 +1645,7 @@ export async function createServer(
     const musicMatch = pathname.match(ELEVENLABS_MUSIC_RE);
     if (musicMatch && req.method === "POST") {
       setCorsHeaders(res);
-      const musicSubType = musicMatch[1];
+      const musicSubType = musicMatch[1] ?? "music";
       try {
         const raw = await readBody(req);
         const chaosResult = applyChaos(
@@ -1720,7 +1720,10 @@ export async function createServer(
 
     // GET /fal/queue/requests/{requestId} — fal.ai Queue Status/Result
     const falQueueRequestsMatch = pathname.match(FAL_QUEUE_REQUESTS_RE);
-    if (falQueueRequestsMatch && (req.method === "GET" || req.method === "POST")) {
+    if (
+      falQueueRequestsMatch &&
+      (req.method === "GET" || req.method === "POST" || req.method === "PUT")
+    ) {
       setCorsHeaders(res);
       try {
         const raw = req.method === "POST" ? await readBody(req) : "{}";