Menu Set store, image pipeline and Site config

The store keeps a Menu Set's state in the directory layout (drafts/ versus
published/) and its metadata in a manifest, with publishing as a single
directory rename. Editing is allowed on Drafts only, so a published menu can
never change under a customer. Stages 2 and 3 of docs/plan.md, with tests.

package.json

@@ -0,0 +1,25 @@
+{
+  "name": "menu-admin",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "start": "node src/server.ts",
+    "dev": "node --watch src/server.ts",
+    "typecheck": "tsc --noEmit",
+    "test": "node --test test/*.test.ts"
+  },
+  "dependencies": {
+    "@fastify/cookie": "^11.1.2",
+    "@fastify/multipart": "^10.1.2",
+    "fastify": "^5.12.5",
+    "sharp": "^0.35.4"
+  },
+  "devDependencies": {
+    "@types/node": "^26.6.2",
+    "typescript": "^7.0.2"
+  }
+}