* feat(announcement): add database schema for SQLite and PostgreSQL
Add announcement table with id, title, content, enabled, created_at, updated_at columns to both SQLite and PostgreSQL schemas to support announcement system.
* feat(announcement): implement SQLite repository for announcement management
Add announcement CRUD operations in SQLite repository including create, read, update, delete, and list methods with proper error handling.
* feat(announcement): add HTTP handlers and auth middleware for announcement API
Implement admin-only update endpoint and public read endpoint for announcements. Add auth middleware to enforce admin-only access for update operations.
* feat(announcement): add frontend API client for announcement endpoints
Implement API client methods for fetching announcements and updating announcement settings with proper error handling.
* feat(announcement): add announcement display component to dashboard
Implement announcement display section in dashboard with real-time updates and proper styling using HeroUI components.
* feat(announcement): add announcement management UI to config page
Implement announcement settings panel with enable/disable toggle and content editor for admin users to manage announcements.
Route diagnosis for shared remote nodes through federation runtime APIs so tunnel and forward diagnostics work across panels, and add contract coverage for single-panel and dual-panel scenarios.
sagit