fix(ai): DeepSeek 余额按官方 balance_infos 解析

/user/balance 返回的是 {is_available, balance_infos[]}，没有顶层 data，
旧实现永远解析出 None，连接测试会显示「余额 None CNY」。同时补全
TotHost 预设平台，新环境初始化后即可直接配 whmcs-panel。

app/adapters/ai.py

@@ -34,12 +34,20 @@ class DeepSeekAdapter(_AIBase):
     BASE = "https://api.deepseek.com"
 
     def _balance(self) -> AccountInfo:
-        data = self._get(self.BASE + "/user/balance").get("data", {})
+        # 官方响应为 {is_available, balance_infos: [{currency,total_balance,...}]}，
+        # 没有顶层 data；同时兼容旧版 data.total_balance 形态。
+        data = self._get(self.BASE + "/user/balance")
+        infos = data.get("balance_infos") or []
+        info = next((i for i in infos if i.get("currency") == "CNY"), infos[0] if infos else {})
+        if not info and isinstance(data.get("data"), dict):
+            info = data["data"]
         try:
-            total = float(data.get("total_balance")) if data.get("total_balance") is not None else None
+            total = float(info.get("total_balance")) if info.get("total_balance") is not None else None
         except (TypeError, ValueError):
             total = None
-        return AccountInfo(balance=total, currency="CNY", raw=data)
+        return AccountInfo(
+            balance=total, currency=info.get("currency") or "CNY", raw=data
+        )
 
     def test_connection(self) -> dict:
         try:

app/core/seed.py

@@ -35,6 +35,10 @@ PRESET_PROVIDERS = [
     {"slug": "linode", "name": "Linode", "name_en": "Akamai Linode", "category": "vps",
      "services": "vps,domain,dns",
      "website": "https://linode.com", "console_url": "https://cloud.linode.com", "sdk_type": "linode-api"},
+    # WHMCS 面板类平台没有开放 API，通过账号关联的登录凭据进入客户区只读核对。
+    {"slug": "tothost", "name": "TotHost", "name_en": "TotHost", "category": "vps",
+     "services": "vps",
+     "website": "https://www.tothost.vn", "console_url": "https://billing.tothost.vn/clientarea.php", "sdk_type": "whmcs-panel"},
     # 以下平台暂无适配器：sdk_type 必须留空。
     # 填了不存在的 sdk_type 会让平台卡片显示「API 对接: xxx」，用户建账号点同步才撞
     # 「暂不支持的 SDK 类型」——声明支持却不支持，比明说不支持更糟。