📝 add Chinese examples and extension docs

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Nanaloveyuki
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# 异步日志生命周期
当 native 异步应用需要通过异步队列处理日志写入时,使用异步包。库声明的可用目标比可执行 `async fn main` 示例更广,仓库示例仍以 native 为主。
## 导入两个包
```moonbit
import {
"Nanaloveyuki/BitLogger/src" @log,
"Nanaloveyuki/BitLogger/src-async" @async_log,
"moonbitlang/async",
}
```
## 构建、运行、关闭
```moonbit
async fn main {
let raw = "{\"logger\":{\"min_level\":\"info\",\"target\":\"service.async\",\"sink\":{\"kind\":\"text_console\"}},\"async_config\":{\"max_pending\":64,\"overflow\":\"DropOldest\",\"max_batch\":16,\"linger_ms\":5,\"flush\":\"Batch\"}}"
let config = @async_log.parse_async_logger_build_config_text(raw) catch {
err => {
ignore(err)
return
}
}
let logger = @async_log.build_async_logger(config)
@async.with_task_group(group => {
group.spawn_bg(allow_failure=true, () => logger.run())
logger.info("worker started", fields=[@log.field("mode", "async")])
logger.shutdown()
})
}
```
`run()` 持有 worker 循环。先启动它再记录日志,并调用 `shutdown()`,使待处理记录按配置的 flush 策略结束。
## 运行仓库示例
```bash
moon run examples/async_basic --target native
```
## 下一步
- 查看[队列](../extend/queue.md)中的溢出与 flush 选择。
- 英文 API[`parse_async_logger_build_config_text(...)`](../../api/parse-async-logger-build-config-text.md)、[`build_async_logger(...)`](../../api/build-async-logger.md)、[`run()`](../../api/async-logger-run.md)、[`shutdown()`](../../api/async-logger-shutdown.md)。