refactor:simplify lambda expressions #363
                
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This PR refactors various lambda expressions across the codebase to use expression-bodied syntax when their bodies contain a single statement. The changes remove unnecessary braces and return keywords, leading to more concise and readable code.
The original implementations often wrapped single-line logic in block bodies with explicit return statements (e.g.,
t => { return new TestDomainEventHandler(); }). Each occurrence has been converted to an expression-bodied lambda (e.g.,t => new TestDomainEventHandler()), eliminating redundant syntax and improving clarity.