docs: add react-auth, react-openapi, vet sites; update standards registry and MCP setup

vet/mcp/modules/main.json

@@ -0,0 +1,8 @@
+{
+  "module": "main",
+  "content": {
+    "path": "main",
+    "docstring": "Application entry point.\r\n\r\nCreates the React root from `#root` and mounts the app: `AppProvider`\r\n(fed by `specConfiguration`) wraps a `BrowserRouter` → `AppTheme` →\r\n`Header` → routed content (`Home` at `/`, `Admin` at `/admin/*`) →\r\n`Footer`.",
+    "objects": {}
+  }
+}