build: Docker compose build successful with all services

- Fixed Dockerfiles (removed admin-ui references)
- Updated Cargo.toml workspace
- Added @tailwindcss/postcss dependency
- All services building and running correctly

apps/backoffice/package.json

@@ -14,6 +14,7 @@
     "react-dom": "19.0.0"
   },
   "devDependencies": {
+    "@tailwindcss/postcss": "^4.2.1",
     "@types/node": "22.13.14",
     "@types/react": "19.0.12",
     "@types/react-dom": "19.0.5",