Remove deprecated entries from Makefile and update documentation

🗑️ Removed:
- Legacy Support section with deprecated targets (k8s-deploy, k8s-undeploy, deploy, undeploy)
- 18 lines of deprecated makefile targets and warnings

📚 Documentation Updates:
- README.md: Updated Kubernetes deployment commands and project structure
- KUSTOMIZE_MIGRATION.md: Replaced deprecated commands with current ones
- k8s-kustomize/README.md: Updated deployment command references
- APP_NAME_CONFIGURATION.md: Updated deployment example command
- config/README.md: Replaced migration script references with config generation
- ARCHITECTURE_MIGRATION.md: Updated to reflect completed migration status
- PROJECT_STRUCTURE.md: Updated services structure to show unified database service
- IMPLEMENTATION_SUMMARY.md: Updated legacy compatibility notes

✨ Improvements:
- Clean Makefile with only current, supported targets
- Consistent documentation referring to current command structure
- Removed all references to deleted CouchDB service files
- Updated project structure diagrams to reflect current architecture

🧪 Verification:
- All 292 unit tests passing
- Integration tests passing
- Makefile help command displays cleanly
- No deprecated command references remain in documentation

Makefile

@@ -210,21 +210,3 @@ undeploy-all: undeploy-dev undeploy-prod docker-clean ## Remove all deployments
 
 ci-check: check validate-k8s ## Complete CI/CD validation pipeline
 	@printf "$(GREEN)CI/CD checks passed!$(RESET)\n"
-
-##@ Legacy Support (Deprecated)
-
-k8s-deploy: ## [DEPRECATED] Use deploy-dev instead
-	@printf "$(YELLOW)Warning: k8s-deploy is deprecated. Use 'make deploy-dev' instead.$(RESET)\n"
-	@$(MAKE) deploy-dev
-
-k8s-undeploy: ## [DEPRECATED] Use undeploy-dev instead
-	@printf "$(YELLOW)Warning: k8s-undeploy is deprecated. Use 'make undeploy-dev' instead.$(RESET)\n"
-	@$(MAKE) undeploy-dev
-
-deploy: ## [DEPRECATED] Use deploy-dev or deploy-prod instead
-	@printf "$(YELLOW)Warning: deploy is deprecated. Use 'make deploy-dev' or 'make deploy-prod' instead.$(RESET)\n"
-	@$(MAKE) deploy-dev
-
-undeploy: ## [DEPRECATED] Use undeploy-dev, undeploy-prod, or undeploy-all instead
-	@printf "$(YELLOW)Warning: undeploy is deprecated. Use 'make undeploy-all' instead.$(RESET)\n"
-	@$(MAKE) undeploy-all