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

app/Containers/Dashboard/Models/IntegrationCredential.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Containers\Dashboard\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class IntegrationCredential extends Model
+{
+    protected $guarded = false;
+
+    protected $casts = [
+        'payload' => 'encrypted:array',
+        'is_active' => 'boolean',
+    ];
+}