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/monitors.json

@@ -0,0 +1,22 @@
+{
+  "items": [
+    {
+      "name": "turnos",
+      "slug": "turnos",
+      "title": "Turnos Monitor",
+      "status": "dev",
+      "system": "ward",
+      "description": "Pipeline view of requests → turnos. Shows vet-petowner at a glance.",
+      "path": "ward/monitor/turnos"
+    },
+    {
+      "name": "data_browse",
+      "slug": "data-browse",
+      "title": "Data Browse",
+      "status": "ready",
+      "system": "ward",
+      "description": "Quick navigation to test users and data states. Book/larder pattern with SQL mode for manual testing workflows.",
+      "path": "ward/monitor/data_browse"
+    }
+  ]
+}