docs: record ListObjects NoSuchBucket decision

[Vonng]

Summary

Add paired English and Chinese design records for pgsty/silo#32 and PR #37.

The records explain:

• why three storage-bypassing listing shortcuts masked a missing bucket as an empty 200;
• why S3 compatibility and upgrade fidelity justify the repair;
• why the implementation checks bucket existence only on those shortcuts;
• the peer/disk fan-out cost, degraded-cluster behavior, race boundary, and remaining P3 edges;
• the completed local review, exact-head PR CI, merge, automatic issue closure, and post-merge main CI;
• the boundary between repository integration and a future release, image, deployment, or production verification.

Verification

• hugo --printPathWarnings
• English and Chinese headings and anchors kept in parity
• git diff --check

Related

• listObjects should return NoSuchBucket when the bucket doesn't exist and prefix is passed silo#32
• fix: ListObjects should return NoSuchBucket for prefix on missing bucket silo#37
• pgsty/silo@49c8aea

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