chore(nginx): add static asset caching and fxtun.ru config

Add Cache-Control: public, immutable with 1y expiry for /assets/ and
/fonts/ (safe due to Vite content hashing). Add blog lang redirects.
Add nginx config for fxtun.ru Russian domain.

Author: mephistofox

configs/nginx.example.conf

@@ -84,6 +84,48 @@ server {
     ssl_protocols TLSv1.2 TLSv1.3;
     ssl_prefer_server_ciphers on;
 
+    # Blog: EN content from Hugo root output
+    location /blog/ {
+        alias /var/www/fxtunnel-blog/;
+        try_files $uri $uri/ =404;
+        expires 1h;
+        add_header Cache-Control "public, no-transform";
+    }
+
+    # /ru/blog/* → redirect to fxtun.ru/blog/*
+    location /ru/blog/ {
+        rewrite ^/ru(/blog/.*)$ https://fxtun.ru$1 redirect;
+    }
+    location = /ru/blog {
+        return 302 https://fxtun.ru/blog/;
+    }
+
+    # /en/blog/* → strip prefix, stay on fxtun.dev
+    location /en/blog/ {
+        rewrite ^/en(/blog/.*)$ $1 redirect;
+    }
+    location = /en/blog {
+        return 302 https://fxtun.dev/blog/;
+    }
+
+    # Cache static assets with content hashes (Vite build output)
+    location /assets/ {
+        proxy_pass http://127.0.0.1:10081;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Cache fonts
+    location /fonts/ {
+        proxy_pass http://127.0.0.1:10081;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
     # Proxy to fxTunnel Web Panel
     location / {
         proxy_pass http://127.0.0.1:10081;