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/base.py

@@ -0,0 +1,46 @@
+"""适配器基类定义。"""
+
+from abc import ABC, abstractmethod
+from typing import Generic, TypeVar
+
+from pydantic import BaseModel
+
+T = TypeVar("T")
+
+
+class AdapterConfig(BaseModel):
+    """适配器配置基类。"""
+
+    api_key: str
+    api_base: str | None = None
+    model: str | None = None
+    timeout_ms: int = 60000
+    max_retries: int = 3
+    extra_config: dict = {}
+
+
+class BaseAdapter(ABC, Generic[T]):
+    """适配器基类，所有供应商适配器必须继承此类。"""
+
+    # 子类必须定义
+    adapter_type: str  # text / image / tts
+    adapter_name: str  # text_primary / image_primary / tts_primary
+
+    def __init__(self, config: AdapterConfig):
+        self.config = config
+
+    @abstractmethod
+    async def execute(self, **kwargs) -> T:
+        """执行适配器逻辑，返回结果。"""
+        pass
+
+    @abstractmethod
+    async def health_check(self) -> bool:
+        """健康检查，返回是否可用。"""
+        pass
+
+    @property
+    @abstractmethod
+    def estimated_cost(self) -> float:
+        """预估单次调用成本 (USD)。"""
+        pass