feat: implement Hybrid SSR for bookshelf page

- Add LibraryData type to templates/types.go
- Update bookshelf template to accept libraries parameter
- Render libraries server-side for faster initial page load
- Libraries now populated from server data instead of AJAX fetch
- JavaScript still uses API for dynamic content (bookshelf items)
- Update /bookshelf route to fetch libraries server-side before render
- Properly handle UUID and pgtype.Text conversions
- Maintain API endpoint compatibility for JavaScript calls

This improves initial page load performance while preserving
dynamic functionality via API calls.

templates/types.go

@@ -38,6 +38,13 @@ type BookData struct {
 	CoverImagePath string
 }
 
+type LibraryData struct {
+	ID          string
+	Name        string
+	Description string
+	TypeName    string
+}
+
 type DeviceData struct {
 	ID            string
 	DeviceName    string