feat(infra-fe): 新增异步编程学习资料与工具实现 - #8
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- custom-promise: 手写 Promise 实现，覆盖状态机与链式调用 - poll-task: 轮询任务工具，支持同步/异步任务与条件终止 - run-task-pool: 任务池并发控制，组合重试策略 - task-with-retry: 异步任务重试封装 - task-with-timeout: 基于 Promise.race 的任务超时控制
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Summary
在 infra-fe 包中新增一组异步编程学习资料与工具实现，覆盖 Promise 原理、轮询、并发控制、重试与超时等常见异步场景。
Changes
custom-promise.ts: 手写 Promise 实现，覆盖状态机、thenable 解析与链式调用poll-task.ts: 轮询任务工具，支持同步/异步任务、条件终止与 AbortSignal 取消run-task-pool.ts: 任务池并发控制，可与重试策略组合task-with-retry.ts: 异步任务重试封装，支持取消与剩余次数上下文task-with-timeout.ts: 基于 Promise.race 的任务超时控制Verification
pnpm -C packages/infra-fe exec eslint src/async-task/0 errorspnpm -C packages/infra-fe type-check通过pnpm build:infra-fe构建成功