feat: reword phase to epic, update mkdocs

docs/content/adr/0029-microservices-architecture.md

@@ -65,16 +65,16 @@ Design the platform as **microservices architecture from day one**:
 
 ## Implementation Strategy
 
-### Phase 1: Service Client Interfaces (Phase 1)
+### Epic 1: Service Client Interfaces (Epic 1)
 - Define service client interfaces for all core services
 - All inter-service communication goes through interfaces
 
-### Phase 2: Service Registry (Phase 3)
+### Epic 2: Service Registry (Epic 3)
 - Create service registry interface
 - Implement service discovery
 - Support for Consul, Kubernetes service discovery
 
-### Phase 3: gRPC Services (Phase 5)
+### Epic 3: gRPC Services (Epic 5)
 - Implement gRPC service definitions
 - Create gRPC servers for all services
 - Create gRPC clients for service communication