frontend: content-hash assets, correct cache headers, enable gzip

services/frontend/nginx.conf

@@ -4,24 +4,45 @@ server {
   root /usr/share/nginx/html;
   index index.html;
 
-  location /assets/ {
-    try_files $uri =404;
-    access_log off;
-    add_header Cache-Control "public, max-age=31536000, immutable";
-  }
+  gzip on;
+  gzip_static on;
+  gzip_vary on;
+  gzip_min_length 256;
+  gzip_comp_level 6;
+  gzip_proxied any;
+  gzip_types
+    text/plain
+    text/css
+    text/javascript
+    application/javascript
+    application/json
+    application/xml
+    application/wasm
+    image/svg+xml
+    font/ttf
+    font/otf
+    font/woff
+    font/woff2;
 
-  location ~* \.(js|css|png|jpg|jpeg|gif|svg|ico|webp|txt|json|map)$ {
+  # Vite-built, content-hashed bundle output. Filename changes when bytes change,
+  # so we can hand out a one-year immutable cache. ^~ ensures this prefix wins
+  # over any regex location.
+  location ^~ /assets/ {
     try_files $uri =404;
     access_log off;
-    add_header Cache-Control "public, max-age=31536000, immutable";
+    add_header Cache-Control "public, max-age=31536000, immutable" always;
   }
 
   location = /healthz {
     return 200 "ok";
     add_header Content-Type text/plain;
   }
 
+  # SPA entry document and unhashed root statics (favicon.png, banner.webp, ...).
+  # These have stable URLs but mutable content, so we force revalidation on every
+  # request. ETag/Last-Modified make 304s cheap.
   location / {
+    add_header Cache-Control "no-cache" always;
     try_files $uri /index.html;
   }
-}
+}

services/frontend/vite.config.mjs

@@ -8,7 +8,14 @@ import istanbul from 'vite-plugin-istanbul'
 
 export default defineConfig({
     build: {
-        target: "esnext"
+        target: "esnext",
+        rollupOptions: {
+            output: {
+                entryFileNames: 'assets/[hash].js',
+                chunkFileNames: 'assets/[hash].js',
+                assetFileNames: 'assets/[hash][extname]',
+            },
+        },
     },
     css: {
         preprocessorOptions: {