feat: implement schema packaging and runtime loading

[nan-yu]

• Add a base InferenceStrategy class
• Add PackSpecsBuildHook to copy JSON schemas into the package during build time.
• Update pyproject.toml to include assets and configure the build hook.
• Implement A2uiSchemaManager for robust schema loading, pruning, and prompt generation.

Description

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Pre-launch Checklist

• I signed the CLA.
• I read the Contributors Guide.
• I read the Style Guide.
• I have added updates to the CHANGELOG.
• I updated/added relevant documentation.
• My code changes (if any) have tests.

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[gemini-code-assist]

Code Review

This pull request introduces schema packaging and runtime loading capabilities, along with a base InferenceStrategy class and an A2uiSchemaManager. The changes include adding a build hook to copy JSON schemas into the package, updating pyproject.toml to include these assets, and implementing robust schema loading and prompt generation logic. New test files have also been added to cover the new functionality. Dependency updates in uv.lock are also included, which appear to be routine updates.