- Add validatePermission function to check depth/level consistency
- Validate permission codes in Perm, Grant, and Check methods
- LevelCreate requires odd depth, other levels require even depth
- Update design.md examples from org to app/role model
- Add RoleID field to Permission struct documentation
- Delete org API endpoints (add_member, create, del, get, list, member, patch, tree)
- Delete models/org.go and remove Org/OrgMember models
- Delete org-related test files (org_crud, org_load_middleware, org_permission, multi_tenant)
- Delete org test scripts (03_org_permission.sh, 04_org_load_middleware.sh)
- Simplify auth/auth.go by removing org context and role loading logic
- Remove org claims from JWT tokens and login/register responses
- Redesign Permission model with hierarchical level-based access control
- Add auth/design.md with new permission system specification
- Update user and role APIs to work without org context
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