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

packages/server/src/notify_bridge_server/services/watcher.py

@@ -111,6 +111,9 @@ async def check_tracker(tracker_id: int) -> dict[str, Any]:
         # Gitea is webhook-based — events arrive via /api/webhooks/gitea endpoint.
         # The scheduler still calls check_tracker but there's nothing to poll.
         return {"status": "ok", "events_detected": 0, "collections_checked": 0}
+    elif provider_type == "planka":
+        # Planka is webhook-based — events arrive via /api/webhooks/planka endpoint.
+        return {"status": "ok", "events_detected": 0, "collections_checked": 0}
     elif provider_type == "scheduler":
         from notify_bridge_core.providers.scheduler import SchedulerServiceProvider
         custom_vars = tracker_filters.get("custom_variables", {})