feat: complete tOS project with HR, LEAN, Dashboard and Integrations modules

Full enterprise web operating system including:
- Next.js 14 frontend with App Router, i18n (DE/EN), shadcn/ui
- NestJS 10 backend with Prisma, JWT auth, Swagger docs
- Keycloak 24 SSO with role-based access control
- HR module (employees, time tracking, absences, org chart)
- LEAN module (3S planning, morning meeting SQCDM, skill matrix)
- Integrations module (PlentyONE, Zulip, Todoist, FreeScout, Nextcloud, ecoDMS, GembaDocs)
- Dashboard with customizable drag & drop widget grid
- Docker Compose infrastructure (PostgreSQL 16, Redis 7, Keycloak 24)

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

apps/web/.env.example

@@ -0,0 +1,14 @@
+# App
+NEXT_PUBLIC_APP_URL=http://localhost:3000
+
+# API
+NEXT_PUBLIC_API_URL=http://localhost:3001/api
+
+# NextAuth
+NEXTAUTH_URL=http://localhost:3000
+NEXTAUTH_SECRET=your-super-secret-key-change-in-production
+
+# Keycloak (must match realm-export.json client "tos-frontend")
+KEYCLOAK_CLIENT_ID=tos-frontend
+KEYCLOAK_CLIENT_SECRET=your-keycloak-frontend-client-secret
+KEYCLOAK_ISSUER=http://localhost:8080/realms/tOS