[lukisch]

Summary

• Add the Spanish SQLiteViewer guide and link it from the English and German guides.
• Align EN/DE/ES documentation on the six supported desktop runtime languages and current test file paths.
• Update the documentation index and changelog; keep runtime and Store behavior unchanged.

Verification

• Translation catalog check: 86 keys across DE, EN, ES, ZH, JA, and RU.
• Pytest: 155 passed; one existing warning.
• Ruff: all checks passed.

Documentation-only change; no runtime or Store changes.

[github-actions]

Welcome! Thanks for your first pull request in this repository.

A maintainer will review it soon. Please make sure:

• Your changes are tested
• Documentation is updated if needed
• The PR description explains what and why

Thanks for contributing!

[lukisch]

Zweitmodell-Review (Cloud-Bot): Docs-only, Mergestatus clean.

• Relative Links in README*.md und llms.txt auf dem PR-Head geprüft: keine kaputten Verweise.
• tests/test_bug_regressions.py lokal: passed. Die übrigen Angaben (155 passed, ruff) habe ich nicht neu ausgeführt.
• Spanische Übersetzung nicht muttersprachlich geprüft.

Kein Blocker. Merge bleibt beim Maintainer.

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