chore: initial commit of foundryvtt-admin

Spun out of the hbm-books working folder into its own repo. A small
backend+frontend+COBOL admin tool for managing Foundry VTT worlds
(socket inspection, join/shutdown debugging).

backend/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "foundryvtt-admin-backend",
+  "version": "1.0.0",
+  "type": "module",
+  "scripts": {
+    "start": "bun run src/index.ts"
+  },
+  "dependencies": {
+    "socket.io-client": "^4.7.5"
+  },
+  "devDependencies": {
+    "@types/node": "^20.11.0",
+    "typescript": "^5.3.3"
+  }
+}