Implement localization for API responses and error messages

- Added localization support for API responses in English and Spanish.
- Introduced a middleware to set the API locale based on the Accept-Language header.
- Updated various exception messages and validation responses to use localized strings.
- Created new language files for English and Spanish translations.
- Refactored existing code to replace hardcoded messages with localized strings.
- Added tests to verify localization functionality and response correctness.

app/Domains/Integration/Requests/StoreTenantIntegrationRequest.php

@@ -20,9 +20,9 @@ class StoreTenantIntegrationRequest extends FormRequest
         $integrationCode = $this->route('integration_code');
         $this->integrationModel = Integration::where('integration_code', $integrationCode)->first();
 
-        if (!$this->integrationModel) {
+        if (! $this->integrationModel) {
             throw ValidationException::withMessages([
-                'integration_code' => 'Integration not found.'
+                'integration_code' => __('api.integration.not_configured'),
             ]);
         }
     }
@@ -34,7 +34,7 @@ class StoreTenantIntegrationRequest extends FormRequest
         // Dynamic validation rules based on the integration data schema
         if ($this->integrationModel && $this->integrationModel->integration_data_schema) {
             foreach ($this->integrationModel->integration_data_schema as $field => $rule) {
-                $rules['integration_data.' . $field] = $rule;
+                $rules['integration_data.'.$field] = $rule;
             }
         }