Enhance runAllFetchs method in CurrencyController for error handling and response formatting

- Wrapped job dispatching calls in a try-catch block to handle potential exceptions during the fetching of currency and gold rates.
- Added JSON response for both success and error scenarios, improving the API's feedback mechanism for clients.
- Updated method documentation to reflect the return type of the method.

These changes improve the robustness and user experience of the currency and gold rates update process.

app/Http/Controllers/CurrencyController.php

@@ -16,12 +16,26 @@ class CurrencyController extends Controller
 {
     /**
      * Dispatches all jobs to fetch currency and gold rates synchronously.
+     * 
+     * @return \Illuminate\Http\JsonResponse
      */
     public function runAllFetchs()
     {
-        FetchCurrencyRates::dispatchSync();
-        FetchGoldRates::dispatchSync();
-        MergeCurrencyAndGoldRates::dispatchSync();
+        try {
+            FetchCurrencyRates::dispatchSync();
+            FetchGoldRates::dispatchSync();
+            MergeCurrencyAndGoldRates::dispatchSync();
+
+            return response()->json([
+                'status' => 'success',
+                'message' => 'All currency and gold rates have been successfully updated'
+            ]);
+        } catch (\Exception $e) {
+            return response()->json([
+                'status' => 'error',
+                'message' => 'An error occurred while updating rates: ' . $e->getMessage()
+            ], 500);
+        }
     }
 
     /**