Create `:sample:kombu` Gradle module with all KMP targets, per-platform windowing, and `:umami-api` dependency

[MessiasLima]

Description

Create the new :sample:kombu Compose Multiplatform module and make it runnable on Android, iOS, JVM Desktop, JS, and WasmJS from the start. The module should depend on :umami-api so that feature work can begin immediately.

• Scope and constraints
  • Mirror the sample:simple-compose-app/composeApp configuration (plugins, targets, source sets).
  • Add include(":sample:kombu") to settings.gradle.kts.
  • Per-platform entry points:
    • androidMain: AppActivity + AndroidManifest.xml
    • iosMain: MainViewController() + iosApp Xcode wrapper project
    • jvmMain: main() with Compose Desktop Window
    • jsMain: main() with ComposeViewport + index.html
    • wasmJsMain: main() with ComposeViewport + index.html
  • JVM toolchain 21, dependency on :umami-api, Compose Material 3, Compose Navigation.
  • No persistent storage, theme, or real API calls in this ticket — just a blank App() that compiles and runs on every target.

Scope

• In scope: module setup, Gradle config, all platform entry points, iOS Xcode project.
• Out of scope: icon assets, theme, navigation, tests, detekt, kover, CSD, real feature code.

Acceptance criteria

• ./gradlew :sample:kombu:assemble succeeds.
• Android app launches and displays a blank screen.
• iOS app launches from Xcode and displays a blank screen.
• Desktop app launches via ./gradlew :sample:kombu:run and shows a window.
• JS and WasmJS apps launch via ./gradlew :sample:kombu:jsBrowserDevelopmentRun / wasmJsBrowserDevelopmentRun.
• settings.gradle.kts includes :sample:kombu.

Additional information

Use the existing sample/simple-compose-app/composeApp module as the reference for Gradle and platform wiring.