Modify ADBPG configuration file format

[swhhy]

Summary

• Add structured ADBPG build, search, and autotune parameters.
• Keep compatibility with existing flattened ADBPG configuration.
• Add regression tests, README documentation, and a Cohere-1M example.

[sre-ci-robot]

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[swhhy]

/assign @XuanYang-cn

Thank you for the review. This PR updates only the ADBPG client by introducing structured build, search, and autotune parameters. A Cohere-1M example and regression tests have been added, and the targeted test suite and Ruff checks pass.

[swhhy]

@XuanYang-cn @yhmo Please take a look at this PR, really appreciate it. 🫶🏻🙏🏻❤️