refactor(gui-agent): optimize supported action type and system prompt processing

[ZhaoHeh]

Summary

• Remove redundant SUPPORTED_ACTION_TYPES array and simplify type checking

  • Replace array-based type validation with direct ACTION_METADATA lookup
  • Optimize isSupportedActionType to use type in ACTION_METADATA

• Extract system prompt template processing into reusable utility

  • Create assembleSystemPromptTemplate function in shared/utils
  • Add isSystemPromptTemplate type guard for better type safety
  • Refactor GUIAgent constructor to use new utility function

• Fix type compatibility issues in SerializeSupportedActions

  • Align supportedActions format with expected SupportedActionType[]
  • Remove unnecessary object mapping in GUIAgent initialization

• Rename processSystemPromptTemplate to assembleSystemPromptTemplate

  • Use more descriptive "assemble" terminology for template processing
  • Update internal variable names from "processed" to "assembled"

This refactoring improves code maintainability, reduces redundancy, and
provides better reusability for system prompt template processing across
different components.

Checklist

• Added or updated necessary tests (Optional).
• Updated documentation to align with changes (Optional).
• Verified no breaking changes, or prepared solutions for any occurring breaking changes (Optional).
• My change does not involve the above items.

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