feat: add kiosk settings UI and co-managed client filtering

- Created kiosk_settings table for configuration storage
- Added API endpoints for kiosk settings (GET/POST)
- Filter out co-managed clients (configurable company exclusions)
- Built comprehensive settings UI at /kiosk/settings
- Allow excluding specific companies from kiosk display
- Configurable cycle interval, refresh interval, and RMM alert toggle
- Updated dashboard link to point to settings page
- Applied company exclusion filter to all ticket queries and activity feed
- Default excludes Thrasher Group (ID: 29861361)

migrations/019_create_kiosk_settings.sql

@@ -0,0 +1,23 @@
+-- Create kiosk_settings table to store kiosk configuration
+CREATE TABLE IF NOT EXISTS kiosk_settings (
+  id SERIAL PRIMARY KEY,
+  setting_key VARCHAR(255) UNIQUE NOT NULL,
+  setting_value TEXT,
+  description TEXT,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Create index on setting_key for faster lookups
+CREATE INDEX IF NOT EXISTS idx_kiosk_settings_key ON kiosk_settings(setting_key);
+
+-- Insert default settings
+INSERT INTO kiosk_settings (setting_key, setting_value, description) VALUES
+  ('excluded_company_ids', '29861361', 'Comma-separated list of company IDs to exclude from kiosk (co-managed clients)'),
+  ('cycle_interval', '7', 'Default cycle interval in seconds (3-15)'),
+  ('refresh_interval', '60', 'Data refresh interval in seconds'),
+  ('show_rmm_alerts', 'false', 'Whether to show RMM alert tickets')
+ON CONFLICT (setting_key) DO NOTHING;
+
+-- Add comment to table
+COMMENT ON TABLE kiosk_settings IS 'Configuration settings for the executive kiosk dashboard';