Add backend package

backend/package.json

@@ -0,0 +1,22 @@
+{
+  "name": "@raspi-chat/backend",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "src/server.js",
+  "scripts": {
+    "dev": "node --watch src/server.js",
+    "start": "node src/server.js"
+  },
+  "dependencies": {
+    "@fastify/cors": "^10.0.1",
+    "@fastify/rate-limit": "^10.2.2",
+    "@fastify/websocket": "^11.0.1",
+    "better-sqlite3": "^11.8.1",
+    "dotenv": "^16.4.7",
+    "fastify": "^5.2.1",
+    "nanoid": "^5.0.9",
+    "pino-pretty": "^13.0.0",
+    "telegraf": "^4.16.3"
+  }
+}