fix: pin TTS==0.22.0 and transformers<4.44 for compatibility

requirements.txt

@@ -12,5 +12,8 @@ soundfile>=0.12
 torch>=2.2,<2.6
 torchaudio>=2.2,<2.6
 
-# XTTS v2 via idiap coqui-tts fork (maintained, built-in voice caching)
-coqui-tts>=0.27.0
+# XTTS v2 - use TTS 0.22.0 (proven stable with transformers 4.43)
+TTS==0.22.0
+
+# Transformers (needed by TTS, pin to compatible version)
+transformers>=4.40,<4.44