chore: переход на static export + nginx для деплоя

Конфигурация совместима с Gitea CI/CD инфраструктурой:
- Static export вместо standalone Node.js
- Nginx для раздачи статики
- Docker multi-stage build

Co-authored-by: Cursor <cursoragent@cursor.com>

docker/nginx.conf

@@ -0,0 +1,24 @@
+server {
+    listen 80;
+    server_name localhost;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    # SPA fallback — all routes to index.html
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+
+    # Cache static assets
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Gzip
+    gzip on;
+    gzip_vary on;
+    gzip_proxied any;
+    gzip_comp_level 6;
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml;
+}