Refactor audiobook service to extract chapters from EPUB files, implement chapter chunking, and enhance project analysis and generation flow

qwen3-tts-backend/schemas/audiobook.py

@@ -36,12 +36,24 @@ class AudiobookCharacterResponse(BaseModel):
 
 class AudiobookProjectDetail(AudiobookProjectResponse):
     characters: List[AudiobookCharacterResponse] = []
+    chapter_count: int = 0
+
+
+class AudiobookGenerateRequest(BaseModel):
+    chapter_index: Optional[int] = None
 
 
 class AudiobookCharacterUpdate(BaseModel):
     voice_design_id: int
 
 
+class AudiobookCharacterEdit(BaseModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    instruct: Optional[str] = None
+    voice_design_id: Optional[int] = None
+
+
 class AudiobookSegmentResponse(BaseModel):
     id: int
     project_id: int