feat: Implement AI script generation for audiobook projects

qwen3-tts-backend/schemas/audiobook.py

@@ -1,5 +1,5 @@
 from datetime import datetime
-from typing import Optional, List
+from typing import Optional, List, Dict, Any
 from pydantic import BaseModel, ConfigDict
 
 
@@ -9,6 +9,16 @@ class AudiobookProjectCreate(BaseModel):
     source_text: Optional[str] = None
 
 
+class ScriptGenerationRequest(BaseModel):
+    title: str
+    genre: str
+    subgenre: str = ""
+    premise: str
+    style: str = ""
+    num_characters: int = 5
+    num_chapters: int = 8
+
+
 class AudiobookProjectResponse(BaseModel):
     id: int
     user_id: int
@@ -17,6 +27,7 @@ class AudiobookProjectResponse(BaseModel):
     status: str
     llm_model: Optional[str] = None
     error_message: Optional[str] = None
+    script_config: Optional[Dict[str, Any]] = None
     created_at: datetime
     updated_at: datetime