feat(cli): suporte i18n completo — 42 locales, --lang flag, config lang get/set/list
- 42 locale files in bin/cli/locales/ (en + pt-BR fully translated, 29 with common/program, 11 scaffolds)
- --lang <code> global flag for per-execution override
- config lang get/set/list subcommands
- Locale persistence via ~/.omniroute/.env
- Path traversal protection via regex validation in normalize()
- Script generate-locales.mjs for scaffolding new locales
- Unit tests for lang commands + normalization security
Integrated into release/v3.8.0
