docs(integration): ZeroFS guide

[majinghe]

Summary

• Add a RustFS integration guide for ZeroFS in all five locales (en/zh/de/fr/ja): developer/integration/big-data/zerofs.md.
• ZeroFS v2.3.5 verified end-to-end against RustFS v2.3.1: LSM tree rooted in a RustFS bucket, NFS mount on a Linux host, files written through the mount survive a ZeroFS restart (sha1-identical), and the bucket holds the LSM tree (compacted/*.sst, wal/, manifest/).
• Update the big-data category index, meta.json, and the integration landing page in all locales.
• Screenshots: zh-locale console shot in zh docs, English shot in en/de/fr/ja.

Notes

Documented v2.3.5-specific pitfalls: [servers.webui] requires uid/gid when present; the container runs as UID 1001 so the cache volume needs chown; AWS_REGION-style [aws] endpoint + allow_http keys redirect ZeroFS to RustFS with path-style addressing (RustFS conditional-put support means no Redis conditional_put fallback is needed).

Validation

• audit-locales.mjs — no findings on new files (only expected de/fr/ja English-copy notices).
• npm run docs:check — OK (7/7 checks).
• npm run build — OK (3495 files generated).
• Integration verified on a live RustFS v2.3.1 instance.

Note: PR #164 (the twelve-guide batch) was merged while this guide was in flight; this PR carries the ZeroFS follow-up rebased on the merged state.

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