feat(notifications): bundle server patch and Traefik notifications per team

[jstet]

Changes

• Server patch and Traefik version notifications can now be bundled into a single notification per team listing all affected servers, instead of one notification per server
• Bundling is configurable per event type (patch vs Traefik), per notification channel (Email, Discord, Slack, Telegram, Pushover, Webhook), per team — disabled by default so existing behavior is preserved
• Uses Laravel's Bus::batch with allowFailures() + finally() to coordinate per-server check jobs and dispatch a summary notification once all checks complete
• Per-server jobs still store results in DB and send immediate notifications to channels that have bundling disabled, so unbundled channels get the original per-server behavior
• Includes race-safe scoped data clearing (only clears servers from the current batch), Traefik notification deduplication via checked_at/notified_at timestamps, WithoutOverlapping compatibility with releaseAfter(60), and queue:prune-batches scheduled daily
• Bundled email template follows existing Traefik email style: compact server list with linked names, critical package summary, security considerations section
• UI: "Bundle Notifications" checkbox nested under "Server Patching" and "Traefik Proxy Outdated" in each notification channel's settings page

Issues

• Fixes [Bug]: Coolify spams one mail per server about outdated Traefik proxies #9251
• Related discussion: Bundling Notifications #9103
• Supersedes fix(proxy): batch Traefik outdated notifications system per team. #9262 (which bundles Traefik only via delay-based approach without Bus::batch, per-channel settings, or race condition protection)

Category

• Bug fix
• Improvement
• New feature
• Adding new one click service
• Fixing or updating existing one click service

AI Assistance

• AI was NOT used to create this PR
• AI was used (please describe below)

If AI was used:

• Tools used: Claude Code (Claude Opus 4.6)
• How extensively: AI assisted with implementation, architectural review and test writing. All changes were reviewed, understood, and verified by the author.

Testing

docker exec coolify php artisan test --compact \
  tests/Feature/BundledNotificationsTest.php \
  tests/Feature/ServerPatchCheckNotificationTest.php \
  tests/Feature/CheckTraefikVersionJobTest.php \
  tests/Unit/CheckTraefikVersionForServerJobTest.php \
  tests/Unit/CheckTraefikVersionJobTest.php

48 tests, 156 assertions — all passing. Covers:

• Per-event per-channel bundle settings (defaults, toggling, filtering)
• Summary job data handling (scoped clearing, unreachable server skipping, Traefik dedup)
• Team isolation (servers don't leak across teams)
• Notification formatting across all 6 channels (Discord, Slack, Telegram, Pushover, Webhook, Email)
• Edge cases (deleted servers, deleted teams, concurrent timezone-staggered batches, empty collections, contradictory flags)
• End-to-end via Notification::assertSentTo (summary jobs actually dispatch notifications to correct teams)

Manual verification: UI toggle visible and functional at Notifications > [channel] > Server section.

Contributor Agreement

Important

• I have read and understood the contributor guidelines. If I have failed to follow any guideline, I understand that this PR may be closed without review.
• I have searched existing issues and pull requests (including closed ones) to ensure this isn't a duplicate.
• I have tested all the changes thoroughly with a local development instance of Coolify and I am confident that they will work as expected when a maintainer tests them.

[github-actions]

This PR did not pass quality checks so it will be closed. If you believe this is a mistake please let us know.