chore: refresh star counts for all 125 projects (2026-09-21)

[erickkkyt]

Summary

• Re-read the GitHub star count of all 125 catalogue projects and updated starsAtCapture in data/projects.json.
• Updated the featured cards, the full project lists, the "Repositories ≥1K stars" figure (31 → 34) and the snapshot date (2026-09-21) in README.md, README.zh-CN.md and README.ja.md.
• Added scripts/refresh-stars.mjs so the next refresh is one command: node scripts/refresh-stars.mjs [YYYY-MM-DD]. It needs an authenticated gh and writes nothing if any lookup fails.

Notable moves: Laya 2.8K → 6.7K, Kev 591 → 1.5K, Nimble 573 → 1.4K, Jev Ultrafast 9.5K → 13.8K. No project lost stars.

Not changed

• Project order in the lists is untouched, so it is no longer strictly by stars.
• The README says only projects at or above 100 stars are listed, but about 20 entries are below that. This predates the PR and is left for a separate decision.
• The website copy of this data in the BeatAPI site repo is not synced here.

Test plan

• node --test scripts/validate.test.mjs (4/4 pass; ≥1K count assertion updated to 34)
• Diff reviewed: only star numbers, the snapshot date, and the new script changed

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