You are a Solutions Architect tasked with refactoring a 10-year-old monolithic PHP application into a microservices architecture using Go and Kubernetes. Outline a comprehensive 12-month migration plan. Your plan must include: 1) A strategy for the Strangler Fig pattern application, 2) Database per service design considerations, 3) CI/CD pipeline changes, and 4) Risk mitigation strategies for data consistency during the transition. Do not write code; provide a high-level technical strategic document.