ci: cache KeePass download

[hieuck]

Summary\r\nCache the downloaded KeePass distribution in CI to avoid repeated SourceForge downloads and improve reliability.\r\n\r\n## Changes\r\n- Add step keyed by KeePass version and runner OS.\r\n- Skip the SourceForge download when the cache hits.\r\n- Add a separate step to verify KeePass.exe exists before exporting .\r\n\r\n## Tests\r\n- CI will exercise both cache-miss (this PR) and cache-hit (subsequent runs).\r\n\r\nCloses #37.

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📥 Commits

Reviewing files that changed from the base of the PR and between fa80e32 and de96f6f.

📒 Files selected for processing (1)

• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/cache-keepass-download

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