Add root docker-compose and webapp Dockerfile/nginx for full-stack deployment

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

webapp/nginx.conf

@@ -0,0 +1,28 @@
+server {
+    listen 80;
+
+    # API und Auth-Endpunkte zum Backend proxieren
+    location /v1/ {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    location /login {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    location /logout {
+        proxy_pass http://api:8080;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+
+    # SPA: alle anderen Routen auf index.html
+    location / {
+        root /usr/share/nginx/html;
+        try_files $uri $uri/ /index.html;
+    }
+}