feat: add classification icons sync from Autotask

- Created company_classifications table to store Autotask classification icons
- Added getClassificationIcons() method to AutotaskClient
- Created /api/sync/classifications endpoint (GET/POST)
- Updated kiosk settings UI to dynamically load classifications
- Added 'Sync from Autotask' button to pull latest classifications
- Removed hardcoded classification list
- Display classification name and description in checkboxes
- Allow excluding any classification synced from Autotask

migrations/021_create_company_classifications_table.sql

@@ -0,0 +1,22 @@
+-- Create company_classifications table to store Autotask classification icons
+CREATE TABLE IF NOT EXISTS company_classifications (
+  id SERIAL PRIMARY KEY,
+  classification_id INTEGER UNIQUE NOT NULL,
+  name VARCHAR(255) NOT NULL,
+  description TEXT,
+  is_active BOOLEAN DEFAULT true,
+  is_system BOOLEAN DEFAULT false,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+  synced_at TIMESTAMP
+);
+
+-- Create index for faster lookups
+CREATE INDEX IF NOT EXISTS idx_company_classifications_name ON company_classifications(name);
+CREATE INDEX IF NOT EXISTS idx_company_classifications_active ON company_classifications(is_active);
+
+-- Add comment
+COMMENT ON TABLE company_classifications IS 'Company classification icons synced from Autotask';
+COMMENT ON COLUMN company_classifications.classification_id IS 'Autotask classification icon ID';
+COMMENT ON COLUMN company_classifications.name IS 'Classification name (e.g., Tools Only, Co-Managed)';
+COMMENT ON COLUMN company_classifications.is_system IS 'Whether this is a system classification';