feat(provider): add AiOnly provider preset

[kongzi10]

Description

This pull request adds support for the AiOnly provider preset.

The purpose of this change is to make AiOnly provider configuration easier for users by adding a built-in provider preset, reducing the need for manual configuration.

Changes

• Added AiOnly provider preset configuration
• Updated provider preset definitions
• Added related provider settings and default parameters
• Improved provider selection compatibility
• Updated corresponding configuration files

Additional Notes

This change only adds a new provider preset and does not modify existing provider behavior.

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• I grant the official edition development team the rights to freely use, modify, and distribute this code, including for commercial purposes.
• I confirm that this code is my original work, or I have obtained the appropriate authorization from the copyright holder to submit this code under these terms.
• I understand that the submitted code will be publicly released under the GPLv3 license, and may also be used in the proprietary official edition.

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