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Manual Dependency Injection with AppDependencies, SystemContext and TestContext

Structure Kotlin applications using manual DI with an interface-first contract (AppDependencies), a production context (SystemContext), and a standalone test context (SystemTestContext). This approach provides type-safe dependency management, full control over initialization, and excellent testability without framework overhead.

Core Pattern: AppDependencies Interface

Define an interface as the contract for all application dependencies. Use nested interfaces to group related components:

interface AppDependencies {
    interface Repositories {
        val customerRepo: CustomerRepository
        val orderRepo: OrderRepository
    }