ci: add Drone pipeline, production Docker setup, frontend Dockerfile

frontend/nginx.conf

@@ -0,0 +1,28 @@
+server {
+    listen 80;
+    server_name _;
+
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # Health probe (checked by Docker + Caddy)
+    location /health {
+        return 200 'ok';
+        add_header Content-Type text/plain;
+    }
+
+    # SPA fallback — any path that isn't a real file serves index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Static asset caching
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff2?)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    gzip on;
+    gzip_types text/plain text/css application/javascript application/json image/svg+xml;
+    gzip_min_length 1024;
+}