feat(dashboard): add unified subscription modal with copy configs dropdown

[MatinDehghanian]

Summary

This PR enhances the users table with a unified subscription modal and restores the copy configs dropdown with all protocol options.

Changes

New Subscription Modal

• Added unified modal accessible via QR code button in users table
• Shows subscription QR code at the top with copy subscription URL button
• Displays paginated configs list (5 per page) with:
  • Config name extracted from URL
  • Individual copy button for each config
  • Individual QR code viewing for each config
• Copy all configs button

Copy Configs Dropdown

• Restored dropdown with all protocol options:
  • 🔗 links
  • 📝 links (base64)
  • ⚡ xray
  • ⚔️ clash (downloads YAML)
  • 🛡️ clash-meta (downloads YAML)
  • 🔒 outline
  • 📦 sing-box (downloads YAML)
• Uses useClipboard hook for visual feedback

Translations

• Added subscription modal translations for en, fa, ru, zh locales

Files Changed

• dashboard/src/components/dialogs/subscription-modal.tsx (new)
• dashboard/src/components/users/action-buttons.tsx
• dashboard/public/statics/locales/en.json
• dashboard/public/statics/locales/fa.json
• dashboard/public/statics/locales/ru.json
• dashboard/public/statics/locales/zh.json

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