feat: Implement AI script generation for audiobook projects

qwen3-tts-backend/db/crud.py

@@ -421,6 +421,7 @@ def create_audiobook_project(
     source_text: Optional[str] = None,
     source_path: Optional[str] = None,
     llm_model: Optional[str] = None,
+    script_config: Optional[Dict[str, Any]] = None,
 ) -> AudiobookProject:
     project = AudiobookProject(
         user_id=user_id,
@@ -429,6 +430,7 @@ def create_audiobook_project(
         source_text=source_text,
         source_path=source_path,
         llm_model=llm_model,
+        script_config=script_config,
         status="pending",
     )
     db.add(project)
@@ -501,6 +503,13 @@ def get_audiobook_chapter(db: Session, chapter_id: int) -> Optional[AudiobookCha
     return db.query(AudiobookChapter).filter(AudiobookChapter.id == chapter_id).first()
 
 
+def get_audiobook_chapter_by_index(db: Session, project_id: int, chapter_index: int) -> Optional[AudiobookChapter]:
+    return db.query(AudiobookChapter).filter(
+        AudiobookChapter.project_id == project_id,
+        AudiobookChapter.chapter_index == chapter_index,
+    ).first()
+
+
 def list_audiobook_chapters(db: Session, project_id: int) -> List[AudiobookChapter]:
     return db.query(AudiobookChapter).filter(
         AudiobookChapter.project_id == project_id

qwen3-tts-backend/db/database.py

@@ -43,6 +43,7 @@ def init_db():
             for col_def in [
                 "ALTER TABLE audiobook_segments ADD COLUMN emo_text VARCHAR(20)",
                 "ALTER TABLE audiobook_segments ADD COLUMN emo_alpha REAL",
+                "ALTER TABLE audiobook_projects ADD COLUMN script_config JSON",
             ]:
                 try:
                     conn.execute(__import__("sqlalchemy").text(col_def))

qwen3-tts-backend/db/models.py

@@ -131,7 +131,8 @@ class AudiobookProject(Base):
     id = Column(Integer, primary_key=True, index=True)
     user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
     title = Column(String(500), nullable=False)
-    source_type = Column(String(10), nullable=False)
+    source_type = Column(String(20), nullable=False)
+    script_config = Column(JSON, nullable=True)
     source_path = Column(String(500), nullable=True)
     source_text = Column(Text, nullable=True)
     status = Column(String(20), default="pending", nullable=False, index=True)