implement foundation + room system (Plan 1 of 5)

Bun workspace monorepo with shared, server, client packages.
Server: Hono + @hono/node-ws, Drizzle + PostgreSQL, in-memory room manager
with WebSocket broadcasting, HTTP room creation, DB persistence layer.
Client: React 19 + Vite + Tailwind v4 + shadcn/ui, TanStack Router with
landing/display/host/player routes, Zustand store, WebSocket connection hook.
20 tests passing (room manager unit + WS integration).

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

package.json

@@ -0,0 +1,18 @@
+{
+	"name": "celebrate-esc",
+	"private": true,
+	"workspaces": [
+		"packages/shared",
+		"packages/server",
+		"packages/client"
+	],
+	"scripts": {
+		"dev": "bun --filter '*' dev",
+		"dev:server": "bun --filter server dev",
+		"dev:client": "bun --filter client dev",
+		"build": "bun --filter '*' build",
+		"test": "bun --filter '*' test",
+		"lint": "biome check .",
+		"format": "biome check --write ."
+	}
+}