refactor: system.build_options as key-value

[bohutang]

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Summary

Refactor system.build_options to be more readable and useful for release artifacts:

• Change schema to key-value: category, name, value.
• Expose build-time metadata used in release CI: query crate Cargo features, target features, Cargo build profile, and opt-level.

For example:

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - User requested skipping tests for this PR update

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[github-actions]

Docker Image for PR

• tag: pr-19137-3527b80-1766404459

note: this image tag is only available for internal use.

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[chatgpt-codex-connector]

Wire build.rs into Cargo manifest

The new build script collects query crate features and emits DATABEND_QUERY_CARGO_FEATURES, but src/query/service/Cargo.toml still has no build = "build.rs" entry, so Cargo never executes this script. As a result the environment variable stays unset and system.build_options will always show the cargo features row as not available, defeating the intent of this change in every build profile.

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