Synchronize trilingual README and user documentation

[gh615280-maker]

Summary

• update the English and Simplified Chinese README for v0.2.0
• add a complete Traditional Chinese README
• split the user guide into English, Simplified Chinese, and Traditional Chinese editions
• add three-language AI-service, local-model, backup/data, and v0.2.0 release documentation
• update the v0.2.0 validation record as an English-only technical document with final public package facts
• keep architecture decisions, test evidence, and internal development plans as single records rather than duplicating them by locale

Verification

• Prettier passed for all repository files
• sensitive-file, license, fixture, and reviewed dependency-policy checks passed
• all six language triads exist, cross-link each other, and have matching section counts
• relative Markdown links: 0 broken
• English-only v0.2.0 validation record: 0 CJK characters
• no localized architecture/testing/internal-plan files added