fix(web): remove --no-turbopack from build script (Docker uses ENV TURBOPACK=0)

The --no-turbopack flag isn't recognized when Next.js runs inside the
Docker builder stage. The Dockerfile already sets ENV TURBOPACK=0 which
achieves the same effect.

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

apps/web/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "build": "next build --no-turbopack",
+    "build": "next build",
     "clean": "git clean -xdf .cache .next .turbo node_modules",
     "dev": "next dev",
     "format": "prettier --check . --ignore-path ../../.gitignore",