feat: lightweight static PCA Lab site with domain groups

Replace Next.js scanner deploy with static React CDN pages: student
VPN cabinet, regional setup, curated blocked-domain lists, and nginx
one-line install on port 80 without touching Amnezia/Docker services.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -1,41 +1,7 @@
-# dependencies
-/node_modules
-/.pnp
-.pnp.*
-.yarn/*
-!.yarn/patches
-!.yarn/plugins
-!.yarn/releases
-!.yarn/versions
-
-# testing
-/coverage
-
-# next.js
-/.next/
-/out/
-
-# production
-/build
-
-# misc
 .DS_Store
-*.pem
 .env
-.env*.local
-
-# debug
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-.pnpm-debug.log*
-
-# vercel
-.vercel
-
-# typescript
-*.tsbuildinfo
-next-env.d.ts
-
-# prisma
-prisma/*.db
+.env.*
+!.env.example
+node_modules/
+.next/
+*.log