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/Main.vue

@@ -22,7 +22,7 @@
           type="button"
           @click="deploySite"
           :disabled="deploying"
-          class="inline-flex items-center gap-2 px-5 py-2.5 bg-primary text-white text-sm font-medium rounded-lg hover:bg-primary-hover transition-all disabled:opacity-50 disabled:cursor-not-allowed shadow-sm hover:shadow-md"
+          class="inline-flex items-center gap-2 px-5 py-2.5 bg-amber-500 text-white text-sm font-medium rounded-lg hover:bg-amber-600 transition-all disabled:opacity-50 disabled:cursor-not-allowed shadow-sm hover:shadow-md"
         >
           <svg v-if="deploying" class="animate-spin w-4 h-4" fill="none" viewBox="0 0 24 24">
             <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>