Add ConfigureAwait(false) to all async/await calls in library code

Co-authored-by: frasermolyneux <34033625+frasermolyneux@users.noreply.github.com>

Author: Copilot

src/MX.Api.Client/Auth/ApiTokenProvider.cs

@@ -87,10 +87,10 @@ public async Task<string> GetAccessTokenAsync(string audience, CancellationToken
         // Get new token
         try
         {
-            var credential = await tokenCredentialProvider.GetTokenCredentialAsync(cancellationToken);
+            var credential = await tokenCredentialProvider.GetTokenCredentialAsync(cancellationToken).ConfigureAwait(false);
             var tokenResult = await credential.GetTokenAsync(
                 new TokenRequestContext(new[] { string.Format(DefaultScopeFormat, audience) }),
-                cancellationToken);
+                cancellationToken).ConfigureAwait(false);
 
             // Cache token with buffer time
             var cacheOptions = new MemoryCacheEntryOptions

src/MX.Api.Client/BaseApi.cs

@@ -145,7 +145,7 @@ public async Task<RestRequest> CreateRequestAsync(string resource, Method method
         var request = new RestRequest(resource, method);
 
         // Apply authentication based on the configured authentication type
-        await ApplyAuthenticationAsync(request, cancellationToken);
+        await ApplyAuthenticationAsync(request, cancellationToken).ConfigureAwait(false);
 
         return request;
     }
@@ -174,7 +174,7 @@ private async Task ApplyAuthenticationAsync(RestRequest request, CancellationTok
                     break;
 
                 case EntraIdAuthenticationOptions entraIdOptions:
-                    await ApplyEntraIdAuthenticationAsync(request, entraIdOptions, cancellationToken);
+                    await ApplyEntraIdAuthenticationAsync(request, entraIdOptions, cancellationToken).ConfigureAwait(false);
                     break;
 
                 default:
@@ -223,7 +223,7 @@ private async Task ApplyEntraIdAuthenticationAsync(
                 throw new InvalidOperationException("IApiTokenProvider not available for Entra ID authentication");
             }
 
-            string accessToken = await apiTokenProvider.GetAccessTokenAsync(options.ApiAudience, cancellationToken);
+            string accessToken = await apiTokenProvider.GetAccessTokenAsync(options.ApiAudience, cancellationToken).ConfigureAwait(false);
             request.AddHeader(AuthorizationHeaderName, $"{BearerTokenPrefix}{accessToken}");
             logger.LogDebug("Added Entra ID token authentication for audience '{Audience}'", options.ApiAudience);
         }
@@ -253,8 +253,8 @@ public async Task<RestResponse> ExecuteAsync(RestRequest request, CancellationTo
         {
             // Execute the request with retry policy
             var response = await retryPolicy.ExecuteAsync(
-                async (token) => await restClientService.ExecuteAsync(options.BaseUrl, request, token),
-                cancellationToken);
+                async (token) => await restClientService.ExecuteAsync(options.BaseUrl, request, token).ConfigureAwait(false),
+                cancellationToken).ConfigureAwait(false);
 
             // Ensure response is not null to prevent NullReferenceException
             if (response is null)