Proposal: Add modern `Promise.allSettled` alternative to "Fetch users" task solution

Description

The current solution for the "Fetch users from GitHub" task demonstrates parallel execution by mixing .then() with async/await. While this serves its stated pedagogical purpose, modern JavaScript codebases typically utilize pure async/await combined with Promise.allSettled for concurrent, fault-tolerant network requests.

Proposal

I propose adding a brief "Alternative modern approach" section to the bottom of the solution.md file. This addition will demonstrate how to achieve the same concurrent execution and error handling using Promise.allSettled and asynchronous array mapping, without removing the original lesson.

阅读 5-network/01-fetch/01-fetch-users/solution.md，以及其中链接的 task.md 和现有的 solution。在保留原课程的同时，添加一个简短的“现代替代方案”部分，使用 Promise.allSettled、async/await 和异步数组映射演示并发且容错的请求。示例清晰、与 task 一致，并记录在 solution 文件中，即表示完成。