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/docs.ts

@@ -89,10 +89,6 @@ function performDocsSearch(query: string): void {
   }
 }
 
-document.addEventListener("DOMContentLoaded", () => {
-  initializeDocsSearch();
-});
-
 Alpine.data("docs", () => ({
   toggleSidebar,
   initializeSearch: initializeDocsSearch,