Initial scaffold: React/Vite/TS PWA + Express/Prisma/Postgres backend

Materialschein & Kabelrechner für BergVOLT Elektrotechnik, portiert von der
vorherigen Single-File-HTML-Version. Microsoft-Entra-ID-Login (MSAL), Projekt-
Dashboard statt einer Datei pro Kunde, Retour-Buchen-Zusammenführung, 111
Kabeltypen aus den offiziellen Meinhart-Datenblättern. gitops/ nach
PROX/deploy-standard: git-backed Portainer-Stack, versionierte Docker-Images,
CI-Commit-back auf gitops/stack.yml.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

client/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "materialschein-client",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@azure/msal-browser": "^3.27.0",
+    "@azure/msal-react": "^2.1.1",
+    "react": "^18.3.1",
+    "react-dom": "^18.3.1",
+    "react-router-dom": "^6.26.2"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.9",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.2",
+    "typescript": "^5.6.2",
+    "vite": "^5.4.8",
+    "vite-plugin-pwa": "^0.20.5"
+  }
+}