C: Reorganize src/ directory

[marcoroth]

This pull request reorganizes the C source tree into a structured directory layout. Source files and their corresponding headers are grouped by subsystem, making the codebase easier to navigate as it grows.

New directory structure:

  src/
  ├── ast/                
  ├── lexer/             
  ├── lib/             
  ├── location/           
  ├── parser/            
  ├── prism/            
  ├── util/             
  ├── analyze/          
  │   └── action_view/
  ├── herb.c            
  ├── lexer.c              
  ├── parser.c            
  ├── extract.c           
  └── [Generated files (errors.c, visitor.c)]

[github-actions]

🌿 Interactive Playground and Documentation Preview

A preview deployment has been built for this pull request. Try out the changes live in the interactive playground:

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_{🌱 Grown from commit a85a10d}

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✅ Preview deployment has been cleaned up.

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1439

npx https://pkg.pr.new/@herb-tools/language-server@1439

npx https://pkg.pr.new/@herb-tools/linter@1439

commit: a85a10d