Use extension method syntax for GetValueWithNormalizedKey across all files

Co-authored-by: captainsafia <1857993+captainsafia@users.noreply.github.com>

Author: Copilot

src/Aspire.Hosting.GitHub.Models/GitHubModelsExtensions.cs

@@ -31,7 +31,7 @@ public static IResourceBuilder<GitHubModelResource> AddGitHubModel(this IDistrib
         var defaultApiKeyParameter = builder.AddParameter($"{name}-gh-apikey", () =>
         {
             var configKey = $"Parameters:{name}-gh-apikey";
-            var value = global::Aspire.IConfigurationExtensions.GetValueWithNormalizedKey(builder.Configuration, configKey);
+            var value = builder.Configuration.GetValueWithNormalizedKey(configKey);
 
             return value ??
                 Environment.GetEnvironmentVariable("GITHUB_TOKEN") ??

src/Aspire.Hosting.OpenAI/OpenAIExtensions.cs

@@ -27,7 +27,7 @@ public static IResourceBuilder<OpenAIResource> AddOpenAI(this IDistributedApplic
         var defaultApiKeyParameter = builder.AddParameter($"{name}-openai-apikey", () =>
         {
             var configKey = $"Parameters:{name}-openai-apikey";
-            var value = global::Aspire.IConfigurationExtensions.GetValueWithNormalizedKey(builder.Configuration, configKey);
+            var value = builder.Configuration.GetValueWithNormalizedKey(configKey);
 
             return value ??
                 Environment.GetEnvironmentVariable("OPENAI_API_KEY") ??

src/Aspire.Hosting/ParameterResourceBuilderExtensions.cs

@@ -207,16 +207,8 @@ internal static string GetParameterValue(IConfiguration configuration, string na
     {
         configurationKey ??= $"Parameters:{name}";
 
-        // First try to get the value with the exact configuration key
-        var value = configuration[configurationKey];
-        
-        // If not found and the name contains dashes, try with underscores as a fallback
-        // This supports command-line arguments and environment variables where dashes are replaced with underscores
-        if (string.IsNullOrEmpty(value))
-        {
-            var normalizedKey = configurationKey.Replace("-", "_", StringComparison.Ordinal);
-            value = configuration[normalizedKey];
-        }
+        // Use the shared helper to get the value with normalization support
+        var value = configuration.GetValueWithNormalizedKey(configurationKey);
 
         return value
             ?? parameterDefault?.GetDefaultValue()