feat: add Planka service provider with full notification and command support

Webhook-based provider for Planka (self-hosted Kanban board) with:
- 15 event types (cards, boards, lists, comments, tasks, attachments, labels)
- Bearer token webhook authentication
- Async API client for boards/cards/lists
- 30 notification templates (en/ru) + 26 command templates (en/ru)
- Bot commands: /status, /boards, /cards, /lists
- Default tracking config, template config, command config seeded on startup
- DB migration for 15 new tracking_config columns
- Frontend: provider config UI with auto-name, Planka-specific hints
- Frontend: tracking config event toggles for all 15 Planka events

frontend/src/lib/grid-items.ts

@@ -101,6 +101,7 @@ export const providerTypeFilterItems = (): GridItem[] => [
 	{ value: '', icon: 'mdiFilterOff', label: t('common.allTypes'), desc: t('gridDesc.allEvents') },
 	{ value: 'immich', icon: 'mdiCamera', label: t('providers.typeImmich'), desc: t('gridDesc.providerImmich') },
 	{ value: 'gitea', icon: 'mdiGit', label: t('providers.typeGitea'), desc: t('gridDesc.providerGitea') },
+	{ value: 'planka', icon: 'mdiViewDashboard', label: t('providers.typePlanka'), desc: t('gridDesc.providerPlanka') },
 	{ value: 'scheduler', icon: 'mdiClockOutline', label: t('providers.typeScheduler'), desc: t('gridDesc.providerScheduler') },
 ];
 
@@ -109,5 +110,6 @@ export const providerTypeFilterItems = (): GridItem[] => [
 export const providerTypeItems = (): GridItem[] => [
 	{ value: 'immich', icon: 'mdiCamera', label: t('providers.typeImmich'), desc: t('gridDesc.providerImmich') },
 	{ value: 'gitea', icon: 'mdiGit', label: t('providers.typeGitea'), desc: t('gridDesc.providerGitea') },
+	{ value: 'planka', icon: 'mdiViewDashboard', label: t('providers.typePlanka'), desc: t('gridDesc.providerPlanka') },
 	{ value: 'scheduler', icon: 'mdiClockOutline', label: t('providers.typeScheduler'), desc: t('gridDesc.providerScheduler') },
 ];