Add documentation for custom settings specific to download.node.ua

web/CUSTOM_SETTINGS.md

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+# Custom Settings for download.node.ua
+
+This file documents the custom settings for our Cobalt instance.
+
+## Environment Variables
+
+When building or running the web frontend, use these environment variables:
+
+```env
+WEB_HOST=download.node.ua
+WEB_DEFAULT_API=https://download.node.ua/
+# Uncomment if you use Plausible analytics
+# WEB_PLAUSIBLE_HOST=your-plausible-host.com
+```
+
+## API Configuration
+
+The API settings in docker-compose.yml:
+
+```yaml
+environment:
+  # API URL configured to your domain
+  API_URL: "https://download.node.ua/"
+
+  # For Collify integration
+  CORS_WILDCARD: "0"
+  CORS_URL: "https://download.node.ua"
+```
+
+## Cookie Configuration
+
+We're using a helper container to provide the cookies:
+
+```yaml
+cookie-helper:
+  build: ./cookie-helper
+  container_name: cobalt-cookie-helper
+  volumes:
+    - cookie-data:/cookies
+
+# In the API container:
+volumes:
+  - cookie-data:/cookies:ro
+```