feat(translations): add Armenian translations

[tigran90]

Summary

Adds default validation error translations for Armenian (hy).

The translations use modern Eastern Armenian with a neutral, formal UI style. Field names are kept in quotation marks and used in constructions such as «{0}» դաշտը ... so translated or technical field names do not need Armenian case suffixes.

What is included

• Armenian translations for all validation tags currently present in translations/en/en.go
• Type-specific messages for strings, numbers, collections, and date/time values
• Armenian cardinal plural registrations for character and item counts
• Tests covering registration, required fields, email, string and collection length, numeric limits, cross-field comparison, oneof, datetime, and plural forms

Notes

• Translation package: translations/hy
• Locale used by tests: github.com/go-playground/locales/hy
• Technical identifiers such as URL, URI, UUID, CIDR, JSON, JWT, ISBN, and RFC names are preserved

Validation

• gofmt applied
• Translation tag/key parity checked against translations/en/en.go
• Full repository test suite should run in CI