chore: initial project scaffold with Fastify server and Vite React app

Set up monorepo structure with server/ (Fastify + TypeScript) and web/ (React + Vite + TypeScript).
Includes package configs, dev proxy setup, and mobile-first CSS foundation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "spelljammer-server",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "tsx watch src/index.ts",
+    "build": "tsc",
+    "start": "node dist/index.js"
+  },
+  "dependencies": {
+    "fastify": "^5.2.1",
+    "@fastify/static": "^8.1.0",
+    "@fastify/cors": "^11.0.0",
+    "socket.io": "^4.8.1",
+    "better-sqlite3": "^11.8.1",
+    "uuid": "^11.1.0",
+    "zod": "^3.24.2"
+  },
+  "devDependencies": {
+    "typescript": "^5.7.3",
+    "tsx": "^4.19.3",
+    "@types/better-sqlite3": "^7.6.13",
+    "@types/uuid": "^10.0.0",
+    "@types/node": "^18.19.0"
+  }
+}