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feat: unified retry/backoff policy shared across channels #7

@cncoder

Description

@cncoder

背景

`grep -r "exponentialBackoff|RetryPolicy" src/` 结果:没有共享实现。各 channel / plugin 自己实现重试逻辑,策略不一致:

  • Discord gateway: `ws` 内部重连(不受控)
  • Telegram: 手写 setTimeout
  • REST 调用: 部分裸调 undici

提案

在 `src/infra/retry/` 提取:

```ts
export class RetryPolicy {
constructor(opts: {
maxAttempts: number;
initialDelayMs: number;
maxDelayMs: number;
jitter: boolean;
retryOn: (err: unknown) => boolean;
}) {}
async execute(fn: () => Promise): Promise {}
}
```

默认策略:

  • 4xx 不重试(除 408/429)
  • 5xx 指数退避 + jitter
  • 网络错误(ECONNRESET/ETIMEDOUT)重试

各 channel 注入统一 policy,可被配置覆盖。

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