feat: AI账号api_key加密存储 + 余额刷新接口与前端按钮

app/schemas/asset.py

@@ -141,10 +141,19 @@ class DomainDetailRead(DomainDetailIn):
     asset_id: int
 
 
-class AIAccountRead(AIAccountIn):
+class AIAccountRead(SQLModel):
+    """AI 账号输出（不暴露 API Key 明文，仅返回 has_api_key）"""
+
     id: int
     asset_id: int
+    provider: str
+    plan: Optional[str] = None
+    balance: Optional[float] = None
+    currency: str = "USD"
+    monthly_usage: Optional[float] = None
+    monthly_limit: Optional[float] = None
     last_synced_at: Optional[datetime] = None
+    has_api_key: bool = False
 
 
 class AssetRead(AssetBase):