feat: add Integration Credentials CRUD and Deploy UI

Integration Credentials:
- Add IntegrationCredential model with encrypted payload
- Add full CRUD: ManageIntegrationCredentialsAction, 4 Tasks, Controller, Requests
- Add migration for integration_credentials table
- Add Vue pages: Index, Create, Edit
- AI tasks now read API keys from DB instead of .env
- Add sidebar menu item

Deploy UI:
- Add DeployTask with full deploy lifecycle management
- Extend DeployController with index, log, history endpoints
- Add Deploy/Index.vue with live polling and deploy log viewer
- Add sidebar menu item and QuickAction for Sveden

UI:
- Add 'key' icon to SidebarNavItem
- Change deploy button color to amber in Main.vue

resources/js/Pages/Dashboard/Components/SidebarNavItem.vue

@@ -76,6 +76,7 @@ const iconMap = {
   'arrow-path': 'arrow-path',
   'academic-cap': 'academic-cap',
   'clipboard-document-check': 'clipboard-document-check',
+  key: 'key',
 };
 
 const iconComponent = computed(() => iconMap[props.item.icon] || 'home');