import aliyun and volcengine stt tts model

[wadecrack]

The "Add Model" page supports both speech recognition and text-to-speech models.

Currently, models from two providers—Alibaba Cloud and Volcano Engine—can be added.

Enter the corresponding parameters, verify connectivity, and then add the model.

The speech model module will display the added models.

On the Q&A page, you can use the configured models to perform ASR and TTS functions.

[codecov]

Codecov Report

❌ Patch coverage is 80.07838% with 305 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sdk/nexent/core/models/ali_stt_model.py	68.66%	112 Missing and 8 partials ⚠️
sdk/nexent/core/models/volc_stt_model.py	73.03%	94 Missing and 9 partials ⚠️
sdk/nexent/core/models/volc_tts_model.py	78.15%	26 Missing ⚠️
backend/apps/voice_app.py	53.48%	17 Missing and 3 partials ⚠️
backend/services/voice_service.py	90.75%	14 Missing and 2 partials ⚠️
sdk/nexent/core/models/ali_tts_model.py	97.39%	3 Missing and 5 partials ⚠️
backend/services/model_health_service.py	78.57%	3 Missing and 3 partials ⚠️
backend/services/config_sync_service.py	89.65%	0 Missing and 3 partials ⚠️
sdk/nexent/core/models/tts_model.py	88.88%	1 Missing and 2 partials ⚠️

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