feat(16-01): create Vite + React + TypeScript project

- packages/web/ with Vite dev server, React 19, TypeScript
- Server proxy /trpc -> http://127.0.0.1:3847 for CORS-free dev
- Root npm workspaces configured (packages/*)
- dev:web script for workspace dev server

packages/web/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@codewalk-district/web",
+  "private": true,
+  "version": "0.0.1",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview",
+    "lint": "tsc --noEmit"
+  },
+  "dependencies": {
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0"
+  },
+  "devDependencies": {
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
+    "@vitejs/plugin-react": "^4.3.4",
+    "typescript": "^5.7.3",
+    "vite": "^6.1.0"
+  }
+}