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/amar/data/books.json

@@ -0,0 +1,79 @@
+{
+  "items": [
+    {
+      "name": "arch-model",
+      "slug": "arch-model",
+      "title": "Architecture Model",
+      "status": "ready",
+      "template": null,
+      "larder": {
+        "name": "arch-model",
+        "slug": "arch-model",
+        "title": "Architecture Model",
+        "status": "ready",
+        "source_template": null,
+        "data_path": "album/book/arch-model"
+      },
+      "output_larder": null,
+      "system": "album"
+    },
+    {
+      "name": "feature-flow",
+      "slug": "feature-flow",
+      "title": "Feature Flow Pipeline",
+      "status": "ready",
+      "template": null,
+      "larder": {
+        "name": "feature-flow",
+        "slug": "feature-flow",
+        "title": "Feature Flow Pipeline",
+        "status": "ready",
+        "source_template": null,
+        "data_path": "album/book/feature-flow"
+      },
+      "output_larder": null,
+      "system": "album"
+    },
+    {
+      "name": "gherkin-samples",
+      "slug": "gherkin-samples",
+      "title": "Gherkin Samples",
+      "status": "ready",
+      "template": null,
+      "larder": {
+        "name": "gherkin-samples",
+        "slug": "gherkin-samples",
+        "title": "Gherkin Samples",
+        "status": "ready",
+        "source_template": null,
+        "data_path": "album/book/gherkin-samples"
+      },
+      "output_larder": null,
+      "system": "album"
+    },
+    {
+      "name": "feature-form-samples",
+      "slug": "feature-form-samples",
+      "title": "Feature Form Samples",
+      "status": "ready",
+      "template": {
+        "name": "feature-form",
+        "slug": "feature-form",
+        "title": "Feature Form Template",
+        "status": "ready",
+        "template_path": "album/template/feature-form",
+        "system": "album"
+      },
+      "larder": {
+        "name": "feature-form",
+        "slug": "feature-form",
+        "title": "Feature Forms",
+        "status": "ready",
+        "source_template": "feature-form",
+        "data_path": "album/book/feature-form-samples/feature-form"
+      },
+      "output_larder": null,
+      "system": "album"
+    }
+  ]
+}