v0.7.0-beta: Projects / Change Cases

[DeepZone]

Motivation

• Provide a lightweight project/workflow container for routing preflight work so checks and reports can be grouped, reviewed and audited as a single traceable Change Case.
• Enable role-aware collaboration (admin/operator create+edit, viewer read-only) and preserve RouteForge's read-only guarantees for external systems.

Description

• Added a new ChangeCase backend model with fields id, title, description, status (draft, in_review, approved, closed), created_by_user_id, created_at and updated_at, and an optional relationship from checks to change_cases via change_case_id (DB/ORM changes in backend/app/models.py).
• Added Alembic migration backend/alembic/versions/0003_change_cases.py to create the change_cases table and add checks.change_case_id FK.
• Implemented new API endpoints in backend/app/api/routes_change_cases.py: GET /api/change-cases, POST /api/change-cases, GET /api/change-cases/{id}, PATCH /api/change-cases/{id}, and GET /api/change-cases/{id}/reports with role checks and status/transition validation.
• Integrated Change Case support into check flow (backend/app/api/routes_checks.py) preserving backward compatibility: check request schemas accept optional change_case_id, checks/reports are linked when provided, and unknown change_case_id yields clean 404 responses; additional audit events are emitted when attachments occur.
• Added audit events for change_case_created, change_case_updated, change_case_status_changed, check_attached_to_change_case and report_attached_to_change_case (via existing audit subsystem).
• Frontend: added ChangeCasesView with list/detail, create button and basic actions, wired navigation entry "Change Cases", API bindings and new types; version labels and system info updated to v0.7.0-beta and frontend package bumped to 0.7.0.
• Documentation: README.md, ROADMAP.md and RELEASE_NOTES.md updated to reference v0.7.0-beta and describe the Change Cases feature.

Testing

• Backend tests executed with cd backend && pytest -q resulting in 92 passed tests (existing suite plus new Change Case tests).
• Frontend built with cd frontend && npm run build and the production build completed successfully (vite build succeeded).
• Added automated smoke tests covering: Change Case CRUD and role permissions, invalid status rejection, attaching a Check to a Change Case, listing Change Case reports, and verifying generated audit events; these tests passed in the CI-local run.

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Codex Task