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/README.md

@@ -0,0 +1,16 @@
+# Deployment templates
+
+## Gitea build pipeline
+- Workflow file: `.gitea/workflows/build-and-push.yml`
+- Pushes Docker image tags to: `git.arnemoerman.be/arne/birthlist`
+  - `latest`
+  - datetime tag (`yyyyMMddHHmm`)
+
+## Portainer stack
+- Stack file: `deploy/portainer-stack.yml`
+- Env template: `deploy/portainer-stack.env.example`
+
+## Notes
+- Set `PAT_TOKEN` secret in Gitea for registry login.
+- Ensure external Docker network `caddy-net` exists.
+- OAuth/SMTP env values can stay empty for MVP; related features will be disabled.