docs(readme): add Trae support sections to translated READMEs (#319)

[tirth8205]

Summary

• The main README.md was updated to include Trae (ByteDance AI IDE) platform support in PR #229 / commit b4b599e, but the seven translated READMEs in READMEs/ were never updated to match.
• This PR adds the four Trae touch-points to each translated README:
  1. Trae badge in the badges block (placed right after the OpenCode badge, mirroring the main README).
  2. Trae appended to the one-line install section heading list.
  3. trae appended to the supported <platform> values bullet.
  4. Trae row appended to the Platform Compatibility table, using each language's existing "Supported" wording.
• Files updated:
  • READMEs/README.zh-CN.md — Simplified Chinese (支持)
  • READMEs/README.zh-TW.md — Traditional Chinese (支援)
  • READMEs/README.ja-JP.md — Japanese (サポート)
  • READMEs/README.ko-KR.md — Korean (지원)
  • READMEs/README.es-ES.md — Spanish (Soportado)
  • READMEs/README.tr-TR.md — Turkish (Destekleniyor)
  • READMEs/README.ru-RU.md — Russian (Поддерживается)
• The main README.md is not changed. No unrelated translation content is touched.

Notes on translation

The four touch-points are mechanical: the badge / one-line heading / supported-values bullet only need the literal token Trae (or trae) appended, so they're identical across languages. The compatibility-table row reuses each file's pre-existing localized word for "Supported" verbatim (copied from the adjacent OpenCode / KIMI CLI rows in the same file) — so there is no free translation involved and nothing for a bilingual reviewer to refine.

Closes #319

Test plan

• grep "install.sh trae" returns a row in all 7 translated READMEs.
• grep "Trae-7e22ce" (the badge color used in the main README) returns the badge in all 7 translated READMEs.
• The one-line install section heading in each translated README ends with / Trae (or / Trae） for CJK files using full-width parens).
• The supported <platform> values bullet in each translated README ends with trae (with locale-appropriate separator: 、 for zh/ja, , for ko/es/tr/ru).
• git diff --stat shows only the 7 translated READMEs changed, each with +4 / -2 lines, totalling +28 / -14.
• The main README.md and all other files are untouched.