feat: RBAC Rollen & Rechte (Phase 1 - Datenmodell, Roles-Verwaltung, Guard-Infrastruktur)

Replaces the fixed 5-value Role enum with a database-driven Role/Permission
model: admins can create custom roles with a precise per-resource/action
permission set (83-key code-owned catalog), instead of being locked to
ADMIN/BEEKEEPER/STAFF/READONLY/API_CLIENT.

- New Role/Permission/RolePermission tables; legacy Role enum renamed to
  LegacyRole and kept as User.legacyRole so all existing @Roles() call
  sites keep working unchanged during the migration.
- New RolesController/RolesService (CRUD, permission-set editing,
  deactivate/reactivate) with lockout-prevention invariants: system roles
  (ADMIN) can't be edited or deactivated, and a role still assigned to
  users can't be deactivated.
- New PermissionResolverService (30s-cached, DB-fresh per user) and
  PermissionsGuard + @RequirePermission(), registered as an additional
  APP_GUARD alongside the legacy RolesGuard so both systems run
  side-by-side until controllers are migrated in Phase 2.
- PermissionCatalogSyncService seeds any new catalog entries into the DB
  on boot, so future features only touch the TS catalog.
- New GET /auth/me returns the caller's role and effective permissions.
- Migration hand-written (destructive column rename) with grants derived
  from a fresh grep of every existing @Roles() call site, verified
  against 5 controllers read in full for STAFF's exact write boundary.
- test/roles.e2e-spec.ts covers the new endpoints and invariants end to
  end; test/authorization-coverage.e2e-spec.ts added but skipped until
  Phase 2 gives every controller a @RequirePermission.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

ApiCore-Backend/test/users.e2e-spec.ts

@@ -28,7 +28,8 @@ describe('Users (e2e)', () => {
         email: adminEmail,
         passwordHash,
         name: 'Users E2E Admin',
-        role: 'ADMIN',
+        legacyRole: 'ADMIN',
+        role: { connect: { key: 'ADMIN' } },
       },
     });
     adminId = admin.id;
@@ -37,7 +38,8 @@ describe('Users (e2e)', () => {
         email: staffEmail,
         passwordHash,
         name: 'Users E2E Staff',
-        role: 'STAFF',
+        legacyRole: 'STAFF',
+        role: { connect: { key: 'STAFF' } },
       },
     });
     staffId = staff.id;