feat: add system quality improvement plan and implementation

e2e_tests/api/user_api.py

@@ -56,3 +56,16 @@ class UserAPI(BaseAPI):
     async def check_email_exists(self, email: str) -> Response:
         """检查邮箱是否存在"""
         return await self.get("/check/email", params={"email": email})
+    
+    async def get_users_by_page(self, page: int = 0, size: int = 10, 
+                               sort: str = "id", order: str = "asc", 
+                               keyword: str = None) -> Response:
+        """分页获取用户"""
+        params = {"page": page, "size": size, "sort": sort, "order": order}
+        if keyword:
+            params["keyword"] = keyword
+        return await self.get("/page", params=params)
+    
+    async def get_user_count(self) -> Response:
+        """获取用户总数"""
+        return await self.get("/count")