fix(core): prevent race condition in dispose method

Updates the `dispose` method in `AppDependencies` to await the completion of the `_initCompleter` before proceeding with resource cleanup.

This change prevents a race condition where `dispose()` could be called while `_initializeDependencies()` is still executing, which would lead to unpredictable errors from tearing down resources that are actively being initialized. The `dispose` method now safely waits for initialization to finish, whether it succeeded or failed, ensuring a clean and predictable shutdown sequence.

Author: fulleni

lib/src/config/app_dependencies.dart

@@ -306,6 +306,18 @@ class AppDependencies {
       return;
     }
 
+    // Wait for initialization to complete before disposing resources.
+    // This prevents a race condition if dispose() is called during init().
+    try {
+      await _initCompleter!.future;
+    } catch (_) {
+      // Initialization may have failed, but we still proceed to dispose
+      // any partially initialized resources.
+      _log.warning(
+        'Disposing dependencies after a failed initialization attempt.',
+      );
+    }
+
     _log.info('Disposing application dependencies...');
     await _mongoDbConnectionManager.close();
     tokenBlacklistService.dispose();