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/src/audit/audit.controller.ts

@@ -1,6 +1,6 @@
 import { Controller, Get, Query } from '@nestjs/common';
 import { ApiBearerAuth, ApiTags } from '@nestjs/swagger';
-import { Role } from '../../generated/prisma';
+import { LegacyRole as Role } from '../../generated/prisma';
 import { Roles } from '../auth/decorators/roles.decorator';
 import { AuditLogService } from './audit-log.service';