refactor: update tts asr api and samples

[666ycy]

Description

Checklist

• Follow the CONTRIBUTING Guide.
• Make your Pull Request title in the https://www.conventionalcommits.org/ specification.
• Ensure the tests pass (Run mvn clean test from the repository root)
• Appropriate docs were updated (if necessary)

Fixes #<issue_number>

Add or Update API

• I have added the necessary test case and all cases have passed.

[tomsun28]

please run the mvn spring-javaformat:apply to fix the code style.

[Copilot]

Pull request overview

This PR refactors the Text-to-Speech (TTS) and Automatic Speech Recognition (ASR) APIs by updating model identifiers, enhancing request parameters, and providing comprehensive sample implementations for both streaming and non-streaming scenarios.

• Updated ASR and TTS model identifiers to newer versions (glm-asr-2512 and glm-tts)
• Enhanced AudioTranscriptionRequest with new fields: fileBase64, prompt, and hotwords to support advanced transcription features
• Simplified response data structures by removing unused fields from AudioTranscriptionChunk, AudioTranscriptionResult, and ChatFunction
• Added four comprehensive sample files demonstrating both streaming and blocking audio operations

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
ChatCompletionExample.java	Added debug print statement for request object
AudioTranscriptionsStreamExample.java	New sample demonstrating streaming audio transcription with chunk processing
AudioTranscriptionsExample.java	New sample showing basic audio transcription with result processing
AudioSpeechStreamExample.java	New sample for streaming TTS conversion with real-time audio chunk handling
AudioSpeechExample.java	Enhanced with explicit stream and responseFormat configuration
ChatFunction.java	Removed unused required field (now properly located in ChatFunctionParameters)
AudioTranscriptionResult.java	Removed unused segments field to simplify response structure
AudioTranscriptionRequest.java	Added new fields for advanced features: fileBase64, prompt, hotwords; updated duration limit documentation from 60s to 30s
AudioTranscriptionChunk.java	Simplified structure by removing choices field, using direct delta string
AudioSpeechStreamingResponse.java	Changed generic type from ObjectNode to ModelData for better type safety
AudioServiceImpl.java	Added voice validation, updated file extension handling to use dynamic responseFormat
Constants.java	Updated model identifiers: glm-asr → glm-asr-2512, cogtts → glm-tts with updated documentation

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[tomsun28]

LGTM！