Refactored ReadEmailTemplateQuery and handler to use non-nullable EmailTemplateDto, throwing NotFoundException when no template is found. Updated namespaces and using statements for consistency. Added detailed XML docs for query properties. Controller updated to reference new query namespace.
Replaced EmailTemplateQueryBase record with IEmailTemplateQuery interface for email template queries. Updated all relevant commands, queries, and controller methods to use the new interface. Removed EmailTemplateQueryBase and migrated properties to implementing classes. Improved documentation to clarify query structure and Type property usage.
Refactored the EmailTemplateQuery record to EmailTemplateQueryBase across the codebase. Updated all references, method signatures, inheritance, and documentation to use the new base type. No functional changes; this improves clarity and generalization for email template queries.
