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/sample_context.py

@@ -142,6 +142,30 @@ _SAMPLE_CONTEXT = {
     "release_body": "Initial release",
     "release_draft": False,
     "release_prerelease": False,
+    # Planka variables (for planka provider templates)
+    "board_name": "My Project",
+    "board_id": "123456",
+    "board_url": "https://planka.example.com/boards/123456",
+    "card_name": "Fix login bug",
+    "card_id": "789012",
+    "card_url": "https://planka.example.com/cards/789012",
+    "card_description": "Users cannot log in with SSO",
+    "card_due_date": "2026-04-01T00:00:00.000Z",
+    "list_name": "In Progress",
+    "list_id": "list-1",
+    "old_list_name": "To Do",
+    "new_list_name": "In Progress",
+    "old_list_id": "list-0",
+    "new_list_id": "list-1",
+    "comment_text": "Looks good, ready for review!",
+    "comment_id": "comment-1",
+    "task_name": "Write unit tests",
+    "task_id": "task-1",
+    "task_completed": True,
+    "attachment_name": "screenshot.png",
+    "attachment_id": "att-1",
+    "label_name": "bug",
+    "label_color": "berry-red",
     # Scheduler variables (for scheduler provider templates)
     "schedule_name": "Daily Reminder",
     "fire_count": 42,