📝 docs: update existing ADRs with user authentication references

Updated existing Architecture Decision Records:
- Added user authentication references to ADR-0008 (BDD Testing)
- Updated ADR-0016 (CI/CD Pipeline) with authentication workflow
- Enhanced ADR-0017 (Trunk-based Development) with BDD integration
- Added security considerations to multiple ADRs
- Updated cross-references throughout documentation

Removed deprecated files:
- docker-compose.cicd-test.yml (replaced by docker-compose.yml)

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

adr/0007-opentelemetry-integration.md

@@ -6,7 +6,7 @@
 
 ## Context and Problem Statement
 
-We needed to add observability to DanceLessonsCoach that provides:
+We needed to add observability to dance-lessons-coach that provides:
 - Distributed tracing capabilities
 - Performance monitoring
 - Request flow visualization
@@ -105,7 +105,7 @@ func (s *Server) getAllMiddlewares() []func(http.Handler) http.Handler {
 telemetry:
   enabled: true
   otlp_endpoint: "localhost:4317"
-  service_name: "DanceLessonsCoach"
+  service_name: "dance-lessons-coach"
   insecure: true
   sampler:
     type: "parentbased_always_on"