Docs: Add Nginx example configuration

nginx.conf.example

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+server {
+    listen 80;
+    server_name your-domain.com;
+
+    # Increase client body size for uploads
+    client_max_body_size 50M;
+
+    # Proxy to Next.js app
+    location / {
+        proxy_pass http://hoerdle:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+        
+        # Important: Forward range headers for audio streaming
+        proxy_set_header Range $http_range;
+        proxy_set_header If-Range $http_if_range;
+        proxy_no_cache $http_range $http_if_range;
+    }
+
+    # Special handling for audio files (optional, for direct serving)
+    location /uploads/ {
+        proxy_pass http://hoerdle:3000;
+        proxy_http_version 1.1;
+        
+        # Enable range requests
+        proxy_set_header Range $http_range;
+        proxy_set_header If-Range $http_if_range;
+        proxy_no_cache $http_range $http_if_range;
+        
+        # Buffering settings for large files
+        proxy_buffering off;
+        proxy_request_buffering off;
+        
+        # Timeouts for large files
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
+    }
+}