Increase job expiration timeout and surface Bottleneck errors to callers

[Copilot]

BottleneckErrors were too frequent due to a tight 20 s job expiration, and when they did occur they were silently swallowed rather than propagated to the caller.

Changes

• Job expiration default: 20 000 ms → 60 000 ms — reduces timeout-driven BottleneckErrors under load
• Error propagation — BottleneckErrors from schedule() already reject the returned Promise; no extra wiring needed. Callers of get(), post(), patch(), etc. can now catch them normally:

try {
  const response = await api.get('/users');
} catch (err) {
  // BottleneckError lands here — safe to retry
  if (err instanceof Error && err.constructor.name === 'BottleneckError') {
    // retry logic
  }
}

The on("error") handlers are intentionally left as console.error — they handle infrastructure-level errors (e.g. Redis) that are not tied to individual requests.

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