implement database migrator and DbUp script execution

[mahmoudsallam2111]

This pull request introduces a standalone Migrator console application and a Shared.SQLScripts class library to significantly improve the solution's database initialization and deployment strategy. By moving migration execution out of the Web project startup and into a dedicated executable, we achieve better separation of concerns and enable enterprise-grade CI/CD patterns, such as running database migrations as pre-deployment jobs. To address the limitations of Entity Framework Core in managing raw SQL assets, this implementation integrates the DbUp library, allowing developers to cleanly partition and execute raw SQL scripts into "everytime" deployments (ideal for Stored Procedures and Views without journaling) and "onetime" deployments (ideal for Seed Data and complex schema changes tracked via a journal table). Additionally, the migrator's dependency injection is fully aligned with the project's multi-provider strategy via C# preprocessor directives, and a minor compilation constant issue in the build properties was resolved to ensure EF Core generates accurate data types for SQL Server instead of falling back to SQLite. Ultimately, this architecture provides a highly reliable, fail-fast migration pipeline that protects the application from starting in an inconsistent state.