Refactor GetApp feature to delegate to GetAppService

[Copilot]

Changes

Extracted business logic from GetApp feature into a new GetAppService, following the established service pattern used throughout the project.

Service Layer

• Created GetAppService abstraction (abstractions/services/GetAppService.ts)
• Created DefaultGetAppService implementation (services/GetAppService/)
• Moved app name validation and path construction logic to service
• Changed dependency from GetProject feature to GetProjectService

Feature Layer

• Updated GetApp feature to delegate to GetAppService
• Reduced feature implementation from 45 to 17 lines

Architecture

// Before
GetApp Feature → Business Logic → GetProject Feature

// After  
GetApp Feature → GetAppService → GetProjectService

All existing consumers of GetApp.Interface continue to work unchanged.

How Has This Been Tested?

Code review and security analysis completed. No breaking changes to existing feature interface.

Documentation

No documentation changes required. Internal refactoring maintains existing API contracts.

Original prompt

we have getApp feature (packages/project/src/features/getApp). I want that to be a service, and then the getApp feature only uses the getAppService and returns its result

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[adrians5j]

Gonna get merged with #4771