feat: support typed list deconstruction assignments

[BackGwa]

Summary

• Replaced the previous { ... } / [ ... ] destructuring syntax with C#-style deconstruction syntax.
• Added list-based deconstruction support for:
  • var (a, b) = list
  • const (a, b) = list
  • (int a, string b) = list
  • (a, b) = list for existing variables
  • _ placeholders
• Updated parser, AST, name resolution, type checking, runtime execution, and module export handling.
• Updated English and Korean documentation to describe list-based deconstruction and remove object destructuring guidance.

Type of Change

• Bug fix (bugs/)
• New feature (features/)
• Refactoring (refactor/)
• Hotfix (hotfix/)
• Chore (chore/)

Self Check

• Code follows the project's coding style
• Self-review completed
• Documentation updated (if necessary)