refactor: simplify single-statement lambda expressions #211
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This PR refactors multiple lambda expressions that only contain a single statement, converting them from block-bodied forms with braces and explicit return keywords to concise expression-bodied lambdas. Across service registrations, domain logic, and test assertions, redundant braces and return statements have been removed to improve readability and reduce verbosity.
AddSingleton<Func<String, String>>,AddSingleton<Func<String, Int32, ISubscriptionRepository>>) and in tests (e.g.,Should.Throw,Should.NotThrow,Retry.For) were written with braces wrapping a single return or await call. Each of these has been converted to an expression-bodied lambda, eliminating unnecessary braces andreturn/asyncblock syntax.