feat(i18n): add type-safe translations with AST-based key validation

[lifeiscontent]

• Rewrite @plane/i18n package with type-safe t() function
• Generate TypeScript types from English translation JSON
• Fix ICU plural format parsing in type generator
• Add 'as const' assertions to i18n fields in constants
• Create AST-based check:i18n script for each app
• Add turbo task for parallel i18n validation
• Convert translation files from TS to JSON format
• Rename locale directories (ua→uk, vi-VN→vi, tr-TR→tr)
• Add missing translation keys and fix key mismatches
• Export KeysWithoutParams type for dynamic key handling

Scripts:

• pnpm check:i18n (per app) - AST-based missing key detection
• pnpm i18n:validate - Cross-locale validation
• pnpm i18n:generate-types - Generate TS types from JSON

All apps pass type checking with 0 errors.

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Improvement (change that would cause existing functionality to not work as expected)
• Code refactoring
• Performance improvements
• Documentation update

Screenshots and Media (if applicable)

Test Scenarios

References

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/i18n-type-safety

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