refactor: rebrand project to HartOMat

backend/app/domains/tenants/models.py

@@ -9,7 +9,7 @@ _DEFAULT_TENANT_CONFIG = {
     "max_concurrent_renders": 3,
     "render_engines_allowed": ["cycles", "eevee"],
     "max_order_size": 500,
-    "fallback_material": "SCHAEFFLER_059999_FailedMaterial",
+    "fallback_material": "HARTOMAT_059999_FailedMaterial",
     "notifications_enabled": True,
     "invoice_prefix": "INV",
     # Azure AI validation (per-tenant)