docs: restructure domain documentation and update references

Implemented a standardized folder structure for domain documentation to improve clarity and maintainability. Migrated existing files to the new structure, updated links in related documentation, and added README files for navigation and guidance.

docs/07_Infrastructure/Reference/ports-and-urls.md

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+---
+owner: project-maintainers
+status: active
+review_cycle: 180d
+last_reviewed: 2025-10-31
+summary: "Übersicht der wichtigsten lokalen URLs und Ports. Quelle: docker-compose.yaml + config/env"
+---
+
+# Referenz: Wichtige URLs und Ports (lokal)
+
+Quelle der Wahrheit für Ports/URLs (Repo-aktuell):
+
+* `docker-compose.yaml`
+* `config/env/.env` (und optional `config/env/.env.local`)
+
+## Infrastruktur
+
+- API Gateway: http://localhost:8081
+- Keycloak (Auth): http://localhost:8180
+- Consul (Service Discovery): http://localhost:8500
+- PostgreSQL: localhost:5432
+- Redis: localhost:6379
+
+## Services
+
+- Ping Service: http://localhost:8082
+- Members Service: http://localhost:8083
+- Horses Service: http://localhost:8084
+- Events Service: http://localhost:8085
+- Masterdata Service: http://localhost:8086
+
+## Monitoring
+
+- Prometheus: http://localhost:9090
+- Grafana: http://localhost:3000
+
+## Clients
+
+- Web App: http://localhost:4000
+- Desktop App (VNC): localhost:5901
+- Desktop App (noVNC): http://localhost:6080
+
+## Hinweise
+
+- Die oben genannten Ports sind aus dem aktuellen Compose-/Env-Setup abgeleitet.
+- Bei Port-Konflikten passe die Werte in `config/env/.env` an (oder nutze lokale Overrides in `config/env/.env.local`).