feat: lots 501-504 — voice-clone endpoint + 19 backends

POST /generate/voice-clone — XTTS-v2 voice cloning (6s ref audio)
19 AI Bridge backends total

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ai-bridge.js

@@ -71,7 +71,7 @@ const server = http.createServer(async (req, res) => {
 
   if (url.pathname === "/health") {
     res.writeHead(200, {"Content-Type":"application/json"});
-    res.end(JSON.stringify({ok:true,service:"ai-bridge",backends:["tts","musicgen","noise","ollama","drums","bass","pad","choir","fx","kokoro-tts","ace-step","demucs","drone","grain","glitch","circus","honk","sound-design"]}));
+    res.end(JSON.stringify({ok:true,service:"ai-bridge",backends:["tts","musicgen","noise","ollama","drums","bass","pad","choir","fx","kokoro-tts","ace-step","demucs","drone","grain","glitch","circus","honk","sound-design","voice-clone"]}));
     return;
   }
   if (url.pathname === "/generate/music" && req.method === "POST") {
@@ -1049,6 +1049,63 @@ const server = http.createServer(async (req, res) => {
   }
 
 
+
+  // ── POST /generate/voice-clone ──
+  // XTTS-v2 voice cloning: 6s reference audio → clone voice
+  if (url.pathname === "/generate/voice-clone" && req.method === "POST") {
+    const body = JSON.parse(await readBody(req));
+    const { text = "Bonjour", reference_audio, language = "fr" } = body;
+    if (!text) { res.writeHead(400, {"Content-Type":"application/json"}); res.end(JSON.stringify({error:"text required"})); return; }
+
+    const out = tmpWav();
+    try {
+      // Use Coqui TTS XTTS-v2 via Python
+      const pyScript = `
+import sys, json
+from TTS.api import TTS
+tts = TTS("tts_models/multilingual/multi-dataset/xtts_v2", gpu=True)
+ref = sys.argv[1] if len(sys.argv) > 1 and sys.argv[1] != "none" else None
+text = sys.argv[2]
+lang = sys.argv[3]
+out = sys.argv[4]
+if ref:
+    tts.tts_to_file(text=text, file_path=out, speaker_wav=ref, language=lang)
+else:
+    tts.tts_to_file(text=text, file_path=out, language=lang)
+print(json.dumps({"ok": True}))
+`;
+      const pyFile = `/tmp/xtts-gen-${Date.now()}.py`;
+      fs.writeFileSync(pyFile, pyScript);
+
+      let refFile = "none";
+      if (reference_audio) {
+        refFile = `/tmp/xtts-ref-${Date.now()}.wav`;
+        fs.writeFileSync(refFile, Buffer.from(reference_audio, "base64"));
+      }
+
+      execSync(`/home/kxkm/venv/bin/python ${pyFile} "${refFile}" "${text.replace(/"/g, '\\"').slice(0, 500)}" "${language}" "${out}"`, {
+        timeout: 120000,
+        env: { ...process.env, CUDA_VISIBLE_DEVICES: "0" }
+      });
+
+      cleanup(pyFile);
+      if (refFile !== "none") cleanup(refFile);
+
+      if (fs.existsSync(out)) {
+        sendWav(res, out);
+      } else {
+        res.writeHead(500, {"Content-Type":"application/json"});
+        res.end(JSON.stringify({error: "XTTS generation failed — no output"}));
+      }
+    } catch(e) {
+      cleanup(out);
+      res.writeHead(500, {"Content-Type":"application/json"});
+      res.end(JSON.stringify({error: e.message}));
+    }
+    return;
+  }
+
+
   // === Auto-Mastering (Matchering) ===
   if (url.pathname === "/master" && req.method === "POST") {
     const tmp_target = "/tmp/ai-master-target-" + Date.now() + ".wav";