refactor(P11+P12): codebase hygiene — CLAUDE.md rewrite, type safety, dead code removal

- Rewrite CLAUDE.md to match current 8-service architecture (was 11, 5 deleted)
- Remove all as-any casts in OrderDetail.tsx (9 casts → 0)
- Add cad_parsed_objects/cad_part_materials to OrderItem interface
- Rename require_admin → require_global_admin across 6 router files (22 calls)
- Remove EXPORT_GLB_PRODUCTION enum + generate_gltf_production_task (dead code)
- Remove worker-thumbnail from ALLOWED_SERVICES, replace Flamenco link
- Delete obsolete PLAN.md (1455 lines) and PLAN_REFACTOR.md (1174 lines)
- Fix digit-only USD prim names with p_ prefix

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/api/orders.ts

@@ -115,6 +115,8 @@ export interface OrderItem {
   thumbnail_path: string | null
   ai_validation_status: string
   ai_validation_result: Record<string, unknown> | null
+  cad_parsed_objects: string[] | null
+  cad_part_materials: Array<{ part_name: string; material: string }>
   item_status: 'pending' | 'approved' | 'rejected'
   notes: string | null
   created_at: string