Initial Blazor birth registry app, theming, and services

Implemented a Blazor Web App (.NET 8) for a public-by-link birth registry platform, following project guidelines. Added domain entities, EF Core context, and Blazor components for authentication, registry management, and public views. Introduced core services for registries, theming, user context, platform owner bootstrapping, and SMTP email. Included static assets (Bootstrap, favicon), launch settings, Dockerfile, CI workflow, and deployment configs. Added bootstrap.min.css.map for improved CSS debugging.

deploy/portainer-stack.env.example

@@ -0,0 +1,17 @@
+# Required for SQL Server container and app DB connection
+SA_PASSWORD=ChangeThisToAStrongPassword123!
+
+# Optional OAuth (leave empty to disable provider at runtime)
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+MICROSOFT_CLIENT_ID=
+MICROSOFT_CLIENT_SECRET=
+
+# SMTP (leave username/password/from address empty to disable mail features)
+SMTP_HOST=smtp.gmail.com
+SMTP_PORT=587
+SMTP_ENABLE_SSL=true
+SMTP_USERNAME=
+SMTP_PASSWORD=
+SMTP_FROM_ADDRESS=
+SMTP_FROM_NAME=Birth Registry