Update project documentation to reflect the completion of Phase 0 and
the current progress of Phase 1. This includes:
- Updating `STATUS.md` and `README.md` to mark Phase 0 as completed.
- Adding details for Phase 1 features: `PriceCalculatorService`, online
order forms, and professional PDF generation.
- Documenting new API endpoints for price calculation and tracking.
- Updating the Laravel technical stack to include `dompdf` and
`laravel-dompdf`.
- Detailing the new directory structure and public web routes.
Update project documentation to reflect the transition to Laravel 11,
Filament 3.3, and the new 4-phase roadmap.
- Mark `PRD_v2.md` as deprecated and provide guidance on official
sources (`Phase0_Proposal.docx`, `STATUS.md`).
- Update `Project_Roadmap.md` to reflect the current 4-phase structure
and Phase 0 progress.
- Revise `04_Laravel/README.md` with detailed setup instructions,
package lists, and directory structure.
- Update root `README.md` with versioning, technology stack details,
and improved project structure overview.
