Add new infra architecture 3

MAILU_MIGRATION_SUMMARY.md

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+# Mailu Migration Summary
+
+This document summarizes the migration from the old Kustomize-based Mailu setup to the new Helm-based setup.
+
+## Files Removed
+
+- `infrastructure/platform/mail/mailu/` - Complete removal of old Kustomize-based Mailu configuration
+- `infrastructure/security/certificates/mailu/` - Removal of old certificate generation scripts
+
+## Files Updated
+
+### Infrastructure Configuration
+- `infrastructure/environments/dev/k8s-manifests/kustomization.yaml` - Removed Mailu resource reference and patches
+- `infrastructure/environments/prod/k8s-manifests/kustomization.yaml` - Removed Mailu resource reference and patches
+- `infrastructure/platform/networking/ingress/base/ingress.yaml` - Removed Mailu-specific ingress rules and TLS entries
+- `infrastructure/monitoring/signoz/README.md` - Updated to reflect Helm-based Mailu deployment
+- `infrastructure/environments/common/configs/secrets.yaml` - Updated comments to reflect new service name
+
+### Service Integration
+- `infrastructure/environments/common/configs/configmap.yaml` - Updated SMTP_HOST to use new Helm service name
+- `infrastructure/monitoring/signoz/signoz-values-prod.yaml` - Updated SMTP configuration to use new service name
+
+## New Files Created
+
+- `infrastructure/platform/mail/mailu-helm/` - New Helm-based Mailu configuration
+  - `values.yaml` - Base configuration values
+  - `dev/values.yaml` - Development-specific overrides
+  - `prod/values.yaml` - Production-specific overrides
+  - `mailu-ingress.yaml` - Sample ingress configuration for use with existing ingress
+  - `README.md` - Comprehensive documentation
+  - `MIGRATION_GUIDE.md` - Migration guide with rollback procedures
+
+## Key Changes
+
+1. **Service Names**: Changed from `mailu-smtp` to `mailu-postfix` (Helm chart service naming)
+2. **Deployment Method**: Switched from Kustomize manifests to Helm chart
+3. **Ingress Configuration**: Disabled built-in ingress to work with existing ingress controller
+4. **Configuration**: All configurations now use Helm values files instead of individual YAML manifests
+
+## Verification
+
+The new configuration has been tested and verified to work with the existing ingress setup, maintaining all critical functionality while improving maintainability.