feat: Integrate IndexTTS2 model and update related schemas and frontend components

qwen3-tts-backend/core/audiobook_service.py

@@ -573,6 +573,16 @@ async def generate_project(project_id: int, user: User, db: Session, chapter_ind
                             "language": "zh",
                             "instruct": _get_gendered_instruct(char.gender, design.instruct),
                         })
+                elif char.use_indextts2 and design.ref_audio_path and Path(design.ref_audio_path).exists():
+                    from core.tts_service import IndexTTS2Backend
+                    indextts2 = IndexTTS2Backend()
+                    audio_bytes = await indextts2.generate(
+                        text=seg.text,
+                        spk_audio_prompt=design.ref_audio_path,
+                        output_path=str(audio_path),
+                        emo_text=char.instruct or None,
+                        emo_alpha=0.6,
+                    )
                 else:
                     if design.voice_cache_id:
                         from core.cache_manager import VoiceCacheManager