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_fetcher.py

@@ -68,13 +68,32 @@ class FakeResponse:
         return self._json
 
 
-PLATFORM_GET = {
-    "method": "GET",
-    "url": "https://x.test/api?key={{apiKey}}",
-    "headers": {"Authorization": "Bearer {{apiKey}}"},
-    "body": "",
-    "balance_path": "data.balance",
-}
+class FakeProvider:
+    """测试用 provider：URL 带 key、余额在 data.balance。"""
+
+    method = "GET"
+
+    def __init__(self, path="data.balance"):
+        self.path = path
+
+    def build_request(self, api_key):
+        return (
+            "https://x.test/api?key=" + api_key,
+            {"Authorization": "Bearer " + api_key},
+            None,
+        )
+
+    def extract_balance(self, data):
+        from app.expr import evaluate_balance
+
+        return evaluate_balance(data, self.path)
+
+
+class FakePostProvider(FakeProvider):
+    method = "POST"
+
+    def build_request(self, api_key):
+        return ("https://x.test/api", {}, '{"api_key": "' + api_key + '"}')
 
 
 class TestFetchBalance:
@@ -88,12 +107,11 @@ class TestFetchBalance:
             return FakeResponse(200, json_data={"data": {"balance": 42.5}})
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "sk-1", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "sk-1", retry_count=2, timeout=10)
         assert result.ok and result.balance == 42.5
         assert len(calls) == 1
 
     def test_post_with_body(self, monkeypatch):
-        platform = dict(PLATFORM_GET, method="POST", body='{"api_key": "{{apiKey}}"}')
         captured = {}
 
         def fake_post(url, headers=None, data=None, timeout=10):
@@ -101,10 +119,21 @@ class TestFetchBalance:
             return FakeResponse(200, json_data={"data": {"balance": 1}})
 
         monkeypatch.setattr("requests.post", fake_post)
-        result = fetch_balance(platform, "sk-2", retry_count=2, timeout=10)
+        result = fetch_balance(FakePostProvider(), "sk-2", retry_count=2, timeout=10)
         assert result.ok
         assert captured["data"] == '{"api_key": "sk-2"}'
 
+    def test_post_content_type_auto(self, monkeypatch):
+        captured = {}
+
+        def fake_post(url, headers=None, data=None, timeout=10):
+            captured["headers"] = headers
+            return FakeResponse(200, json_data={"data": {"balance": 1}})
+
+        monkeypatch.setattr("requests.post", fake_post)
+        fetch_balance(FakePostProvider(), "sk-2", retry_count=0, timeout=10)
+        assert captured["headers"].get("Content-Type") == "application/json"
+
     def test_401_retries_then_auth_error(self, monkeypatch):
         calls = []
 
@@ -113,7 +142,7 @@ class TestFetchBalance:
             return FakeResponse(401, text="unauthorized")
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "bad", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "bad", retry_count=2, timeout=10)
         assert not result.ok and result.auth_error
         assert len(calls) == 3  # 401 也按重试次数确认后再判定
 
@@ -125,7 +154,7 @@ class TestFetchBalance:
             return FakeResponse(401) if len(calls) == 1 else FakeResponse(200, json_data={"data": {"balance": 6.6}})
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=2, timeout=10)
         assert result.ok and result.balance == 6.6
         assert len(calls) == 2  # 瞬时 401 重试后成功，不误判禁用
 
@@ -137,13 +166,13 @@ class TestFetchBalance:
             return FakeResponse(500) if len(calls) < 3 else FakeResponse(200, json_data={"data": {"balance": 5}})
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=2, timeout=10)
         assert result.ok and result.balance == 5
         assert len(calls) == 3
 
     def test_5xx_all_fail(self, monkeypatch):
         monkeypatch.setattr("requests.get", lambda *a, **k: FakeResponse(503))
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=2, timeout=10)
         assert not result.ok and not result.auth_error
 
     def test_network_error_retries(self, monkeypatch):
@@ -157,7 +186,7 @@ class TestFetchBalance:
             return FakeResponse(200, json_data={"data": {"balance": 8}})
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=2, timeout=10)
         assert result.ok and result.balance == 8
 
     def test_other_4xx_no_retry(self, monkeypatch):
@@ -168,19 +197,19 @@ class TestFetchBalance:
             return FakeResponse(404, text="not found")
 
         monkeypatch.setattr("requests.get", fake_get)
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=2, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=2, timeout=10)
         assert not result.ok and not result.auth_error
         assert "404" in result.error
         assert len(calls) == 1
 
     def test_bad_json_path(self, monkeypatch):
         monkeypatch.setattr("requests.get", lambda *a, **k: FakeResponse(200, json_data={"x": 1}))
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=0, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=0, timeout=10)
         assert not result.ok
         assert "路径不存在" in result.error
 
     def test_invalid_json_body(self, monkeypatch):
         monkeypatch.setattr("requests.get", lambda *a, **k: FakeResponse(200, text="<html>"))
-        result = fetch_balance(PLATFORM_GET, "k", retry_count=0, timeout=10)
+        result = fetch_balance(FakeProvider(), "k", retry_count=0, timeout=10)
         assert not result.ok
         assert "JSON" in result.error