Performance: OPcache, gzip, font subsetting, lazy-loaded pages

- Enable PHP OPcache in Docker (256MB, dev-friendly settings)
- Enable gzip compression in nginx + immutable caching for /build/ assets
- Reduce fonts to latin-only subsets (from 28 files to ~6)
- Lazy-load Vue pages via dynamic imports (D3 no longer loaded on login)
- MetroMap chunk split out separately (62KB only when needed)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/nginx/default.conf

@@ -7,6 +7,14 @@ server {
 
     charset utf-8;
 
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css text/xml application/json application/javascript application/xml+rss application/atom+xml image/svg+xml;
+    gzip_min_length 1000;
+
     # Handle static files directly
     location ~* \.(css|js|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|map)$ {
         expires max;
@@ -14,6 +22,12 @@ server {
         access_log off;
     }
 
+    location /build/ {
+        expires max;
+        add_header Cache-Control "public, immutable";
+        gzip_static on;
+    }
+
     # Laravel routing — try files, then directories, then pass to index.php
     location / {
         try_files $uri $uri/ /index.php?$query_string;