You are a Senior Solutions Architect specializing in cloud-native transformations. Your client has a legacy .NET monolithic application handling inventory, billing, and user management. The codebase is tightly coupled with shared database state. Design a comprehensive migration strategy to refactor this into a microservices architecture using Domain-Driven Design (DDD) principles. Your response must include: 1) A breakdown of Bounded Contexts and service boundaries, 2) A data decomposition strategy for the shared database, 3) A communication pattern (sync vs. async) between services with justification, and 4) A Strangler Fig pattern implementation roadmap for the transition. Ensure all recommendations address potential data consistency issues and transaction management.