Document ESLint rules and translation validation in CLAUDE.md

Add documentation for:
- TypeScript strict typing rules (no-explicit-any, consistent-type-assertions)
- Examples of good/bad code patterns for any and type assertions
- Translation rules - always use t() instead of inline strings
- Translation validation commands and how to fix issues
- Scripts location and usage instructions

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>