refactor: separate standalone and managed room configs

- veins → shunts rename
- add cfg/standalone/ and cfg/<room>/ structure
- remove old data/*.json (moved to cfg/<room>/data/)
- update build.py and ctrl scripts

cfg/standalone/data/tools.json

@@ -0,0 +1,48 @@
+{
+  "items": [
+    {
+      "name": "tester",
+      "slug": "tester",
+      "title": "Contract Tests",
+      "status": "live",
+      "system": "ward",
+      "type": "app",
+      "description": "HTTP contract test runner with multi-environment support. Filter, run, and track tests against dev/stage/prod.",
+      "path": "ward/tools/tester",
+      "url": "/tools/tester/"
+    },
+    {
+      "name": "datagen",
+      "slug": "datagen",
+      "title": "Test Data Generator",
+      "status": "live",
+      "system": "ward",
+      "type": "cli",
+      "description": "Generate realistic test data for Amar domain (users, pets, services) and MercadoPago API responses. Used by mock veins and test seeders.",
+      "path": "ward/tools/datagen",
+      "cli": "python -m datagen"
+    },
+    {
+      "name": "generate_test_data",
+      "slug": "generate-test-data",
+      "title": "DB Test Data Extractor",
+      "status": "dev",
+      "system": "ward",
+      "type": "cli",
+      "description": "Extract representative subsets from PostgreSQL dumps for testing/development.",
+      "path": "ward/tools/generate_test_data",
+      "cli": "python -m generate_test_data"
+    },
+    {
+      "name": "modelgen",
+      "slug": "modelgen",
+      "title": "Model Generator",
+      "status": "dev",
+      "system": "ward",
+      "type": "cli",
+      "description": "Generate platform-specific models (Pydantic, Django, Prisma) from JSON Schema.",
+      "path": "ward/tools/modelgen",
+      "cli": "python -m modelgen"
+    }
+  ]
+}