Feature/crud api

[RaymondC-tech]

Closes #30

Description

POST + PUT + DELETE REST api completed with RBAC + soft delete + barcode uniqueness

Acceptance Criteria

• New items created via API appear immediately in lists.
• Archived items are hidden from the Public Catalogue but remain in the database for historical tracking.
• Invalid data (e.g., missing title) is rejected.

Test

Running test with following command should yeild 100% with close to 100% test coverage:
cd backend
source venv/bin/activate
pytest inventory/tests.py -v

[Copilot]

Pull request overview

Implements admin/volunteer CRUD endpoints for inventory items, including RBAC enforcement, soft-delete archival behavior, and barcode/UUID uniqueness validation, with accompanying tests for create/edit/delete flows.

Changes:

• Added AdminCollectionItemViewSet (ModelViewSet) to support POST/PATCH/DELETE with role-based permissions and soft delete behavior.
• Updated inventory routing to expose /api/inventory/items/ (admin/volunteer) alongside /api/inventory/public/items/ (public read-only).
• Introduced a writable admin serializer with item_code uniqueness validation and added CRUD-focused tests.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
backend/inventory/views.py	Adds admin/volunteer CRUD ViewSet and soft-delete implementation.
backend/inventory/urls.py	Registers new admin routes and adjusts public route registration.
backend/inventory/serializers.py	Adds writable serializer and explicit uniqueness validation message for item_code.
backend/inventory/tests.py	Adds auth helpers/fixtures and tests for POST/PATCH/DELETE CRUD behavior.
.DS_Store	Adds an OS-generated artifact file (should not be committed).

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