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

qwen3-tts-backend/db/crud.py

@@ -564,6 +564,7 @@ def update_audiobook_character(
     description: Optional[str] = None,
     instruct: Optional[str] = None,
     voice_design_id: Optional[int] = None,
+    use_indextts2: Optional[bool] = None,
 ) -> Optional[AudiobookCharacter]:
     char = db.query(AudiobookCharacter).filter(AudiobookCharacter.id == char_id).first()
     if not char:
@@ -578,6 +579,8 @@ def update_audiobook_character(
         char.instruct = instruct
     if voice_design_id is not None:
         char.voice_design_id = voice_design_id
+    if use_indextts2 is not None:
+        char.use_indextts2 = use_indextts2
     db.commit()
     db.refresh(char)
     return char

qwen3-tts-backend/db/models.py

@@ -173,6 +173,7 @@ class AudiobookCharacter(Base):
     description = Column(Text, nullable=True)
     instruct = Column(Text, nullable=True)
     voice_design_id = Column(Integer, ForeignKey("voice_designs.id"), nullable=True)
+    use_indextts2 = Column(Boolean, default=False, nullable=False)
 
     project = relationship("AudiobookProject", back_populates="characters")
     voice_design = relationship("VoiceDesign")