feat(templates): add service language template management

Add normalized service and template catalogs, scoped administration, migration, validation, and regression coverage.

Ref: IT-1601

README.md

@@ -4,9 +4,21 @@ Production image references now use `registry.hrynco.com`, preserving the existi
 
 ## Documentation
 
+- [Email template definitions and service languages](docs/email-template-localizations.md)
 - [ItemTracker outbox email consumer](docs/itemtracker-outbox-email-consumer.md)
 - [Shared Notification Service Kubernetes package](docker/kubernetes/shared-notification/README.md)
 
+## Windows host development
+
+For the owner's host development workflow, run Web in Rider with the Development
+profile (`localhost:5433` PostgreSQL, HTTP `localhost:5188`) and keep Docker Web
+stopped. Infrastructure can remain in the existing Docker stack. Web does not apply
+schema migrations automatically. The owner's local database is prepared only when
+they choose to run the current Migrator with an explicit connection setting.
+See [template migration and local setup](docs/email-template-localizations.md) for
+backup, conflict, compatibility and validation details. The full Docker installation
+below is a separate complete-stack workflow.
+
 ## Development environment
 
 The development Docker Compose stack runs PostgreSQL, RabbitMQ, database migrations,
@@ -58,7 +70,7 @@ docker compose --env-file docker/environments/.env.local `
 After startup, the main development endpoints are:
 
 - Notification Service admin: `http://localhost:5200/admin/channels`
-- Notification templates: `http://localhost:5200/admin/templates`
+- Services and their notification templates: `http://localhost:5200/admin/services`
 - RabbitMQ management: `http://localhost:15672` (`guest` / `guest`)
 - Mailpit inbox: `http://localhost:8025`
 - Seq logs: `http://localhost:5342`