test: add comprehensive structure approach tests

Tests for different project structures:
- Monorepo with multiple services
- Node.js/TypeScript projects
- Python projects
- Deep nested structures (7+ levels)
- Mixed language projects
- Strict vs permissive mode
- Special characters in paths
- Empty directories
- Comprehensive ignore patterns

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: machado144