External API integrations (pure API calls only).

Services should:

• Be single-purpose functions that make direct API calls to external systems
• Be pure functions that handle HTTP transport layer (response.ok)
• Return consistent { success: boolean, data?: any, error?: string } format
• NOT handle environment variables, business logic, or orchestrate multiple calls

• updatePageUrl(pageId, url) - Updates a Notion page's URL property
• getPageById(pageId) - Retrieves a single Notion page
• getDatabaseById(databaseId) - Retrieves a Notion database
• getDatabasePages(databaseId) - Queries pages from a Notion database
• getDatabases() - Lists all accessible Notion databases

All functions return the standard {success, data/error, timestamp} format.