Initial commit: twin-optimiser sub-app (housekeeping category)

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

frontend/nginx.conf

@@ -0,0 +1,37 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+
+    location = /twin-optimiser/manifest.json {
+        add_header Cache-Control "no-cache";
+        try_files $uri =404;
+    }
+
+    location /twin-optimiser/api/ {
+        proxy_pass http://backend:3001/api/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        add_header Cache-Control "no-store";
+    }
+
+    location /twin-optimiser/health {
+        proxy_pass http://backend:3001/health;
+    }
+
+    location ~* /twin-optimiser/.*\.(js|css|png|ico|svg|woff2?)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+        try_files $uri =404;
+    }
+
+    location /twin-optimiser/ {
+        add_header Cache-Control "no-cache" always;
+        try_files $uri $uri/ /twin-optimiser/index.html;
+    }
+
+    location = / {
+        return 301 /twin-optimiser/;
+    }
+}