Centralized dependency injection setup by adding a reference to
`EnvelopeGenerator.DependencyInjection` in the project file and
replacing multiple `using` directives with a single one.
Replaced obsolete `AddEnvelopeGeneratorInfrastructureServices`
and `AddEnvelopeGeneratorServices` methods with the new
`AddEnvelopeGenerator` method, consolidating service and
infrastructure setup.
Encapsulated `EGDbContext` configuration within
`AddEnvelopeGenerator` and removed obsolete `#pragma` directives.
Simplified mail service registration by replacing manual
`IEnvelopeMailService` setup with `AddEnvelopeMailService`.
These changes improve maintainability, reduce redundancy, and
modernize the codebase.
TekH
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