feat: Introduce client management and integration updates

- Added client_id field to StoreTenantRequest and UpdateTenantRequest for tenant management.
- Updated TenantResource to include client_id in the response.
- Created migration to establish clients table and link tenants to clients.
- Migrated existing tenant integrations to client_integrations table.
- Grouped specific tenants under a shared client (OnTicket) in a new migration.
- Updated seeders to reflect new client structure and relationships.
- Adjusted integration configurations to require client instead of tenant.
- Added tests for client integration functionality and ensured existing tests reflect the new client structure.

app/Domains/Client/Requests/UpdateClientRequest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Domains\Client\Requests;
+
+use App\Domains\Client\Models\Client;
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateClientRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        /** @var Client|null $client */
+        $client = $this->route('client');
+
+        return [
+            'code' => ['sometimes', 'string', 'max:255', Rule::unique('clients', 'code')->ignore($client?->id)],
+            'name' => ['sometimes', 'string', 'max:255'],
+        ];
+    }
+}