docs: add Authentication section to Weblite page

Author: damlayildiz

sqlite-cloud/platform/weblite.mdx

@@ -32,6 +32,10 @@ https://<your-project-id>.<your-hosted-zone>.gateway.sqlite.cloud
 
 You can copy the exact base URL for your project from the Weblite panel in the dashboard.
 
+## Authentication
+
+All Weblite endpoints require an `Authorization: Bearer` header. The value can be either an [API Key](/docs/apikey) or an [Access Token](/docs/access-tokens). The examples below use an API key; for per-user or browser access, use an access token.
+
 ## Services
 
 Services are endpoints for health checks, server information, and more.