Infer string keys for UUID and ULID models

[shuvroroy]

Models using Laravel's HasUuids or HasUlids traits currently expose an implicit integer primary key. This change resolves that key as string, including traits composed through other traits or inherited from parent models, so completion, hover, and diagnostics agree with the model's identifier type.

Trait detection uses bounded traversal and avoids cloning class metadata. Custom primary-key names and existing property precedence are preserved. Includes regression tests, Laravel playground examples with runtime assertions, a changelog entry, and removal of the completed L12 backlog item.

Validation

• Full Rust suite under cargo llvm-cov: 14,730 passed, 2 ignored.
• Documentation tests: 1 passed, 10 ignored.
• Added executable Rust lines: 47/47 covered (100%) against main.
• cargo clippy --fix --allow-dirty -- -D warnings, cargo clippy --all-targets -- -D warnings, and cargo fmt --check pass.
• PHP playground syntax checks and runtime assertions pass; Laravel runtime assertions pass (187 assertions).
• Laravel analysis reports the three intentional demo errors and the existing named-slot closing-tag diagnostic. The slot issue is being addressed in a separate PR; this PR does not modify the Blade template.

Checklist

• Updated docs/CHANGELOG.md.
• Updated documentation and examples.
• Added tests covering the behavior and edge cases.
• Reviewed the code for correctness and performance.
• Reviewed the documentation, comments, and commit description.

No config schema changes are required.

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Codecov Report

✅ All modified and coverable lines are covered by tests.

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