* feat: Add powerful CLI for account management
- 18 commands for quota monitoring, switching, validation
- Interactive mode with keyboard navigation
- Smart auto-switch based on quotas
- Alias support for quick access
- Token auto-refresh and diagnostics
- Full documentation in cli/README.md"
* fix: Address code review issues - Add SQLite transactions for atomicity\n- Add input validation for import_accounts\n- Add per-account error handling in bulk operations\n- Add graceful error handling in interactive mode\n- Add validation for varint encoding (negative values)\n- Improve user feedback on partial failures
