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.
