Add GDPR data export/deletion and API rate limiting features

[sagnik11]

TL;DR

Implements GDPR compliance features including contact data export and deletion, along with API rate limiting configuration. Users can now export individual contact data or permanently delete contacts with confirmation, and API keys support configurable rate limiting per minute.

What changed?

GDPR Data Export & Deletion

• Added handleGdprExport() function to download contact data as JSON via /api/internal/contacts/{id}/gdpr-export endpoint
• Added handleGdprDelete() function to permanently delete contacts and associated data via /api/internal/contacts/{id}/gdpr-delete endpoint with email confirmation requirement
• Added dropdown menu to each contact row with "Export GDPR data" and "Delete (GDPR)" options
• Added confirmation dialog for GDPR deletion that requires users to type the contact's email address to confirm
• Added state management for deletion workflow (gdprDeleteContact, gdprConfirmEmail, gdprDeleting)

UI Updates

• Imported DropdownMenu components for contact action menus
• Added actions column to contacts table with three-dot menu button
• Updated table colSpan values from 4 to 5 to account for new actions column
• Updated loading and empty state messages to span correct number of columns

API & Configuration

• Added rateLimitPerMinute field to ApiKey interface for API rate limiting configuration

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