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

package.json

@@ -3,6 +3,7 @@
   "version": "0.0.1",
   "description": "Multi-agent workspace for orchestrating multiple Claude Code agents",
   "type": "module",
+  "workspaces": ["packages/*"],
   "main": "./dist/index.js",
   "bin": {
     "cw": "./dist/bin/cw.js"
@@ -13,7 +14,8 @@
     "clean": "rimraf dist",
     "test": "vitest run",
     "test:watch": "vitest",
-    "test:coverage": "vitest run --coverage"
+    "test:coverage": "vitest run --coverage",
+    "dev:web": "npm run dev --workspace=packages/web"
   },
   "keywords": [
     "claude",