Modernize PHP 8.5 project models and generators

[luispabon]

Summary

• Modernize archive and generator internals with immutable file values and stateless file generation
• Convert PHP extension metadata and project service options to constructor-driven immutable models
• Extract form-data hydration into ProjectFactory to slim down GeneratorController
• Add enum-backed service version catalogs while preserving existing string APIs for forms and templates

Verification

• make static-analysis
• make clear-cache && make unit-tests
• make coverage-tests