Initial commit: clean project structure

- Backend: FastAPI + SQLAlchemy + Celery (Python 3.11+)
- Frontend: Vue 3 + TypeScript + Pinia + Tailwind
- Admin Frontend: separate Vue 3 app for management
- Docker Compose: 9 services orchestration
- Specs: design prototypes, memory system PRD, product roadmap

Cleanup performed:
- Removed temporary debug scripts from backend root
- Removed deprecated admin_app.py (embedded UI)
- Removed duplicate docs from admin-frontend
- Updated .gitignore for Vite cache and egg-info

backend/app/services/adapters/text/models.py

@@ -0,0 +1,11 @@
+from dataclasses import dataclass
+from typing import Literal
+
+
+@dataclass
+class StoryOutput:
+    """故事生成输出。"""
+    mode: Literal["generated", "enhanced"]
+    title: str
+    story_text: str
+    cover_prompt_suggestion: str