refactor(alpine): migrate remaining pages to x-init declarative initialization

- Remove DOMContentLoaded event listeners from analytics.ts and docs.ts
- Rely on x-init attribute in templates for page initialization
- Clean up unused exports from collections.ts Alpine data
- Add x-init calls to admin_library, analytics, and docs templates
- Normalize quote style in collections WebSocket script (single to double)
- Disable Add Books button in collection detail (pending implementation)

web/src/analytics.ts

@@ -122,8 +122,6 @@ function renderPopularBooks(popular: PopularBooksResponse): void {
     .join("");
 }
 
-document.addEventListener("DOMContentLoaded", loadAnalytics);
-
 export { loadAnalytics };
 
 Alpine.data("analytics", () => ({