fix: performance issue from @Copilot in #213

[Groupguanfang]

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Latest commit: d3d75f8

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[Copilot]

Pull request overview

This PR addresses a performance issue by optimizing AST traversal in semantic token processing. The fix consolidates two separate tree walks into a single traversal, significantly reducing computational overhead when processing semantic classifications.

Key changes:

• Introduced a new findAnnotationOrDecoratorNodeInPosition function that checks for three node types in a single AST traversal
• Replaced two sequential findNodeInPosition calls with one consolidated call in the semantic token processing loop

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