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Greptile Summary

This PR adds nine translated README files (Traditional Chinese, Simplified Chinese, Japanese, Korean, German, Spanish, French, Italian, and Brazilian Portuguese) and updates the main README.md with a language selector. Each translation is a comprehensive, well-structured Claude-generated version of the full English README, complete with an AI-translation disclaimer and a consistent language selector at the top.

• All 9 translated files are complete and cover every section of the original README (features table, installation, community projects, development setup, and useful commands).
• Language selectors in each file correctly highlight the current language as plain text and link all others — navigation between files is properly symmetric.
• README.zh-CN.md and README.zh-TW.md incidentally fix a pre-existing <h3>/</h4> tag mismatch from the original README.md (using the correct </h3>), while the other 7 translated files reproduce the original's mismatched closing tag — creating a minor inconsistency between the translated files themselves.
• The contrib.rocks contributors image URL (repo=stack-auth/stack) is copied faithfully from the original README.md across all translations — this is a pre-existing issue not introduced by this PR.

Confidence Score: 5/5

• This is a documentation-only PR with no functional code changes; it is safe to merge.
• All changes are Markdown documentation files. Translations are comprehensive, well-organized, and consistent with the original. The only finding is a minor heading tag inconsistency between two Chinese files (correct </h3>) and the remaining seven translated files (mismatched </h4>), which mirrors a pre-existing issue in the original README and has no rendering impact in practice.
• No files require special attention.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md\nEnglish] --> B{Language Selector}
    B --> C[README.zh-TW.md\n繁體中文]
    B --> D[README.zh-CN.md\n简体中文]
    B --> E[README.ja.md\n日本語]
    B --> F[README.ko.md\n한국어]
    B --> G[README.de.md\nDeutsch]
    B --> H[README.es.md\nEspañol]
    B --> I[README.fr.md\nFrançais]
    B --> J[README.it.md\nItaliano]
    B --> K[README.pt-BR.md\nPortuguês Brasil]

    C <-->|cross-links| D
    C <-->|cross-links| E
    D <-->|cross-links| F

_{Reviews (1): Last reviewed commit: "Add README translations for 9 languages" | Re-trigger Greptile}