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* fix(s3api): return 503 with Retry-After when remote object not cached yet When a GET hits a remote-only object whose cache fill timed out or was canceled, the handler returned 500 InternalError. SDK clients treat 500 as a server bug and surface it as a fatal error (boto3 S3DownloadFailedError), even though the cache is often still filling in the background and the next request would succeed. Return 503 ServiceUnavailable with Retry-After: 5 instead, matching AWS S3's "try again later" semantics. AWS SDKs already classify 503 as retryable and apply exponential backoff transparently, so clients recover without changes. Refs https://github.com/seaweedfs/seaweedfs/discussions/9174 * treat client cancel as cancellation, not 503 If r.Context() is already canceled when the cache attempt returns no chunks, the cache failure is almost certainly a side-effect of the client disconnecting, not real backpressure. Surface the context error so GetObjectHandler logs at V(3) and skips writing a response, instead of synthesizing a 503 that nobody will read. Addresses Gemini review feedback on #9233. * simplify comments