refactor: 平台改为代码内置 provider 架构，一次性迁移现有数据 - 新增 app/providers：BalanceProvider 基类 + DeepSeek 适配器 + 注册表 - platforms 表去除 method/url/headers/body/balance_path，新增 provider_id - 现有数据库已一次性迁移（备份 data/monitor.db.bak-v1），不保留迁移工具 - 平台 UI 改为选择内置提供方；fetcher/monitor 走 provider 构建请求与解析 - 表达式引擎（运算符/函数）随架构保留，供 provider 内部使用 - 测试更新至 provider 模式，共 92 个

tests/test_providers.py

@@ -0,0 +1,52 @@
+"""内置平台适配器测试。"""
+
+import pytest
+
+from app.expr import ExprError
+from app.providers import get_provider, list_providers
+from app.providers.deepseek import DeepSeekProvider
+
+DEEPSEEK_RESPONSE = {
+    "is_available": True,
+    "balance_infos": [
+        {
+            "currency": "CNY",
+            "total_balance": "1.34",
+            "granted_balance": "0.00",
+            "topped_up_balance": "1.34",
+        }
+    ],
+}
+
+
+class TestDeepSeek:
+    def test_build_request(self):
+        prov = DeepSeekProvider()
+        url, headers, body = prov.build_request("sk-abc")
+        assert url == "https://api.deepseek.com/user/balance"
+        assert headers["Authorization"] == "Bearer sk-abc"
+        assert body is None
+        assert prov.method == "GET"
+
+    def test_extract_balance(self):
+        assert DeepSeekProvider().extract_balance(DEEPSEEK_RESPONSE) == 1.34
+
+    def test_extract_missing(self):
+        with pytest.raises(ExprError):
+            DeepSeekProvider().extract_balance({"is_available": False})
+
+
+class TestRegistry:
+    def test_get_provider(self):
+        prov = get_provider("deepseek")
+        assert isinstance(prov, DeepSeekProvider)
+
+    def test_unknown_provider_none(self):
+        assert get_provider("nope") is None
+
+    def test_list_providers(self):
+        provs = list_providers()
+        ids = [p["id"] for p in provs]
+        assert "deepseek" in ids
+        dp = next(p for p in provs if p["id"] == "deepseek")
+        assert dp["name"] == "DeepSeek" and dp["currency"] == "CNY" and dp["icon"] == "DeepSeek"