v1.6.23 - Restricted Chat Rooms with NOSTR Auth

What's New

Restricted Chat Rooms

• Add support for private/restricted chat rooms with role-based access control
• Role hierarchy: Owner > Admin > Moderator > Member > Banned
• Room visibility toggle in Chat Settings page (owner/admin only)
• Room Management page for member/role management

API Enhancements

• 11 new API endpoints for member management with NOSTR authentication
• Replay attack prevention with action-specific event tags
• Comprehensive test suite (25 tests passing)

Bug Fixes

• Fix visibility toggle for channels without existing config (creates default)
• Handle null config gracefully when changing room visibility

New Files

• lib/pages/room_management_page.dart - Full member/role management UI
• tests/restricted_chat_test.dart - Comprehensive test suite
• tests/run_restricted_chat_test.sh - Test runner script
• tests/voice_test.dart - Voice recording tests