updated docs

docs/data/en/standalone.md

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+# Standalone Room
+
+A standalone room is soleprint by itself — no managed app. Good for documentation, tool development, or running the platform independently.
+
+## Structure
+
+```
+cfg/standalone/
+  config.json
+  data/*.json          # 12 registry files
+  soleprint/
+    docker-compose.yml
+```
+
+Build output is flat — all systems merged into one directory:
+
+```
+gen/standalone/
+```
+
+## config.json
+
+Three sections:
+
+- **framework** — name, port
+- **systems** — artery, atlas, station toggles and settings
+- **components** — the naming scheme used across the room
+
+## Data registries
+
+The `data/*.json` files are registries: `veins.json`, `tools.json`, `books.json`, etc.
+
+Each follows the same shape:
+
+```json
+{
+  "items": [
+    {
+      "name": "...",
+      "slug": "...",
+      "title": "...",
+      "status": "..."
+    }
+  ]
+}
+```