feat: Grundgeruest fertigstellen (Backend/Frontend/K8s)

Backend: Prisma-Client auf prisma-client-js + Driver-Adapter (@prisma/adapter-pg)
umgestellt (Prisma 7 verlangt Adapter, ESM-Client brach an Jest), erste Migration
erzeugt und angewendet, /api/v1 Versioning, Swagger unter /api/v1/docs, Helmet,
globale ValidationPipe, PrismaModule, HealthModule (/health, /health/ready mit
DB-Check), tsconfig.build.json Root-Dir-Fix (dist/main.js statt dist/src/main.js).

Frontend: Tailwind v4 + shadcn/ui initialisiert, TanStack Query Provider, PWA
Manifest (app/manifest.ts), Vitest + Testing Library Setup, next.config output
standalone.

deploy/k8s: Dockerfiles (Backend/Frontend, Multi-Stage) + Deployment/Service/
Ingress/ConfigMap/Secret-Vorlagen fuer beide Projekte.

Lokale Dev-/Test-Postgres-Instanz unter ApiCore-Backend/.devdb angelegt (eigene
Rolle, kein bestehendes Passwort noetig), .env/.env.test lokal befuellt.

Lint, Typecheck, Tests und Build sind fuer Backend und Frontend gruen; Server
wurde lokal gestartet und /health, /health/ready, /api/v1/docs manuell verifiziert.

deploy/k8s/backend/deployment.yaml

@@ -0,0 +1,45 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: apicore-backend
+  labels:
+    app: apicore-backend
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: apicore-backend
+  template:
+    metadata:
+      labels:
+        app: apicore-backend
+    spec:
+      containers:
+        - name: apicore-backend
+          image: REGISTRY/apicore-backend:latest
+          ports:
+            - containerPort: 3001
+          envFrom:
+            - configMapRef:
+                name: apicore-backend-config
+            - secretRef:
+                name: apicore-backend-secret
+          livenessProbe:
+            httpGet:
+              path: /health
+              port: 3001
+            initialDelaySeconds: 10
+            periodSeconds: 15
+          readinessProbe:
+            httpGet:
+              path: /health/ready
+              port: 3001
+            initialDelaySeconds: 5
+            periodSeconds: 10
+          resources:
+            requests:
+              cpu: 100m
+              memory: 128Mi
+            limits:
+              cpu: 500m
+              memory: 512Mi