Update MiniMax TTS default model

[octo-patch]

Reason: MiniMax TTS is integrated but still defaults to speech-02-turbo instead of the target speech-2.8-hd model.

Summary

• Update the built-in MiniMax TTS provider template to default to speech-2.8-hd.
• Add a focused config regression test for the MiniMax TTS default model.

Test plan

• uv --directory /root/octopatch-4/work/repos/AstrBotDevs_AstrBot run --group dev pytest tests/unit/test_config.py -k minimax_tts_default_model_is_speech_28_hd
• uv --directory /root/octopatch-4/work/repos/AstrBotDevs_AstrBot run --group dev ruff check astrbot/core/config/default.py tests/unit/test_config.py
• git -C /root/octopatch-4/work/repos/AstrBotDevs_AstrBot diff --check

Summary by Sourcery

Update MiniMax TTS configuration to use the current HD speech model as the default and add a regression test to lock in this behavior.

New Features:

• Introduce a dedicated test asserting the default MiniMax TTS model in configuration metadata.

Enhancements:

• Change the MiniMax TTS provider template default model from speech-02-turbo to speech-2.8-hd in the core configuration metadata.

Tests:

• Add a focused unit test verifying that the MiniMax TTS default model is speech-2.8-hd via CONFIG_METADATA_2.

[gemini-code-assist]

Code Review

This pull request updates the default model for MiniMax TTS from 'speech-02-turbo' to 'speech-2.8-hd' in the configuration, and adds a corresponding unit test to verify this default setting. There are no review comments, so I have no feedback to provide.

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[sourcery-ai]

Hey - I've left some high level feedback:

• The test hardcodes the provider display name key "MiniMax TTS(API)", which could be brittle if the label changes; consider keying the lookup by a more stable identifier (e.g., provider id or enum) to make the test more robust.
• Accessing deeply nested CONFIG_METADATA_2["provider_group"]["metadata"]["provider"]["config_template"] directly in the test couples it tightly to the config structure; consider introducing a small helper or fixture that encapsulates this lookup so future structural changes only need to be updated in a single place.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The test hardcodes the provider display name key `"MiniMax TTS(API)"`, which could be brittle if the label changes; consider keying the lookup by a more stable identifier (e.g., provider id or enum) to make the test more robust.
- Accessing deeply nested `CONFIG_METADATA_2["provider_group"]["metadata"]["provider"]["config_template"]` directly in the test couples it tightly to the config structure; consider introducing a small helper or fixture that encapsulates this lookup so future structural changes only need to be updated in a single place.

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