feat(api): 实现三端统一的JSON API响应契约

- 新增`api_response.py`统一响应封装工具类，提供标准成功/错误响应构造方法
- 重构WonderQ-Admin全局异常处理器，将所有异常转换为标准响应格式
- 修改所有公共和管理端接口的返回逻辑，统一使用`code`（与HTTP状态码一致）、`msg`和`data`的三层结构
- 新增`api-response-contract.md`文档，定义完整的三端统一JSON响应规范
- 更新所有领域API文档，明确业务数据需位于`data`字段内，补充响应格式说明
- 为WonderQ-MiniAPP和WonderQ-Admin-UI新增响应解析逻辑和类型定义，自动完成协议校验和错误处理
- 更新所有测试用例，适配新的响应结构确保接口符合契约要求
- 新增`module-config-api.md`模块配置API文档，补充站点模块配置的接口约定
- 更新项目README文档，调整文档分类顺序将响应契约置于首位

WonderQ-Admin/tests/test_api_response.py

@@ -0,0 +1,65 @@
+import json
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.api_response import error_response
+from app.database import get_db
+from app.main import create_app
+
+
+class EmptyDb:
+    def scalar(self, _statement):
+        return None
+
+
+def test_health_uses_the_standard_success_envelope():
+    response = TestClient(create_app()).get("/health")
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "code": 200,
+        "msg": "success",
+        "data": {"ok": True, "service": "miniapp-api"},
+    }
+
+
+def test_public_not_found_uses_the_standard_error_envelope():
+    app = create_app()
+    app.dependency_overrides[get_db] = lambda: EmptyDb()
+
+    try:
+        response = TestClient(app).get("/api/public/details/missing-detail")
+    finally:
+        app.dependency_overrides.clear()
+
+    assert response.status_code == 404
+    assert response.json() == {
+        "code": 404,
+        "msg": "详情不存在",
+        "data": None,
+    }
+
+
+def test_request_validation_uses_the_standard_error_envelope():
+    response = TestClient(create_app()).post("/api/public/leads", json={})
+
+    assert response.status_code == 400
+    body = response.json()
+    assert body["code"] == 400
+    assert body["data"] is None
+    assert body["errorCode"] == "VALIDATION_ERROR"
+    assert body["msg"]
+
+
+@pytest.mark.parametrize("status_code", [400, 401, 404, 409, 422, 500])
+def test_supported_error_statuses_keep_the_same_envelope(status_code):
+    response = error_response(status_code, "示例错误", error_code="EXAMPLE_ERROR")
+
+    assert response.status_code == status_code
+    assert json.loads(response.body) == {
+        "code": status_code,
+        "msg": "示例错误",
+        "data": None,
+        "errorCode": "EXAMPLE_ERROR",
+    }