Fix OpenAI audio options merging order

  Resolves #601

Author: tzolov

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiAudioSpeechClient.java

@@ -133,7 +133,7 @@ private OpenAiAudioApi.SpeechRequest createRequestBody(SpeechPrompt request) {
 
 		if (request.getOptions() != null) {
 			if (request.getOptions() instanceof OpenAiAudioSpeechOptions runtimeOptions) {
-				options = this.merge(options, runtimeOptions);
+				options = this.merge(runtimeOptions, options);
 			}
 			else {
 				throw new IllegalArgumentException("Prompt options are not of type SpeechOptions: "

models/spring-ai-openai/src/main/java/org/springframework/ai/openai/OpenAiAudioTranscriptionClient.java

@@ -178,7 +178,7 @@ OpenAiAudioApi.TranscriptionRequest createRequestBody(AudioTranscriptionPrompt r
 
 		if (request.getOptions() != null) {
 			if (request.getOptions() instanceof OpenAiAudioTranscriptionOptions runtimeOptions) {
-				options = this.merge(options, runtimeOptions);
+				options = this.merge(runtimeOptions, options);
 			}
 			else {
 				throw new IllegalArgumentException("Prompt options are not of type TranscriptionOptions: "