* Added migration logic in `controller/console_migrate.go`
* Detects both `UptimeKumaUrl` and `UptimeKumaSlug`
* Creates a single-group JSON array under `console_setting.uptime_kuma_groups`
- Uses `categoryName: "old"` to mark migrated data
- Preserves original `url` and `slug` values
* Clears and removes obsolete `UptimeKumaUrl` and `UptimeKumaSlug` keys
* Removes outdated code paths that wrote to `console_setting.uptime_kuma_url` and `console_setting.uptime_kuma_slug`
* Keeps frontend `DashboardSetting.js` compatible — no additional changes required
* Aligns migration behavior with previous `ApiInfo` refactor for consistent console settings management
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