Treat file-only/hotfix updates (identified by commit SHA) as non-version changes and clear stale commit-cache so the UI no longer reports an available update after a hotfix. UpdateService now clears commits_behind_count and latest_remote_sha when no new commits are found. LayoutHelper and settings view consider installed_commit_sha vs latest_remote_sha and set commitsBehind to 0 when they match. NotificationService detects commit SHAs for the target version and emits a clearer "hotfix {sha}" message for file-only updates.
Handle hotfix upgrade messaging and clear stale update state after applying updates.
- UpdateController: when notifying admins for hotfixes, pass the current app version as the "to" version so notifications read e.g. "v1.1.3 has been updated" instead of showing a commit SHA.
- NotificationService: adjust system upgrade message to show a simple "has been updated" message when fromVersion equals toVersion (hotfix/file updates) and standard "upgraded from X to Y" otherwise; factor migration label formatting.
- UpdateService: clear cached update-check state after a successful update (add clearUpdateCache method) so the UI no longer shows a stale "update available" card. Keep latest_available_version unchanged to avoid view inconsistencies before migrations run.
Implement CSV/JSON import and export for domains, notification groups and tags (with masking for sensitive channel data), including size/format validation, in-memory CSV building, and logging. Add tag transfer and bulk transfer actions (admin-only). Introduce a new update system: Add UpdateController and UpdateService, migration 025_add_update_system_v1.1.3.sql, and installer changes to include the new migration and version handling; provide endpoints to check, apply, rollback and configure updates. Update helpers and UI bits: add getUpdateBadgeInfo in LayoutHelper, update notification icons/redirects, and add getMaxUploadSize in ViewHelper. Misc: add NotificationGroup::findByName, tweak .gitignore backups path, and update related views and routes.
