Migrate from swiftklib to native Kotlin SwiftPM import

[Copilot]

Replaces the third-party swiftklib plugin with native Kotlin SwiftPM import support introduced in Kotlin 2.4.0-titan-214.

Configuration Changes

• settings.gradle.kts: Point to packages.jetbrains.team/maven/p/kt/dev
• libs.versions.toml: Kotlin 2.0.21 → 2.4.0-titan-214, remove swiftklib
• build.gradle.kts: Add KGP version constraint via buildscript block

Build Script Migration

// Before (swiftklib)
swiftklib {
    create("RadioPlayer") {
        path = file("native/RadioPlayer")
        packageName("dev.markturnip.radioplayer")
        minIos = 14
    }
}

// After (native SwiftPM)
swiftPMDependencies {
    iosDeploymentVersion.set("14.0")
    localPackage(
        path = projectDir.resolve("native/RadioPlayer"),
        products = listOf("RadioPlayer")
    )
}

Import Namespace Change

// Before
import dev.markturnip.radioplayer.MediaPlayController

// After
import swiftPMImport.dev.markturnip.radioplayer.MediaPlayController

Framework changed to dynamic (isStatic = false) per SwiftPM integration requirements.

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[markst]

Seems I'm unable to run integrateLinkagePackage:

radioplayer-kt % ./gradlew radioplayer:integrateEmbedAndSign
Reusing configuration cache.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':radioplayer:generateSyntheticLinkageSwiftPMImportProjectForLinkageForCli'.
> Cannot query the value of task ':radioplayer:generateSyntheticLinkageSwiftPMImportProjectForLinkageForCli' property 'syntheticImportProjectRoot' because it has no value available.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 332ms
Configuration cache entry reused.

radioplayer-kt % ./gradlew radioplayer:integrateLinkagePackage
Reusing configuration cache.

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':radioplayer:generateSyntheticLinkageSwiftPMImportProjectForLinkageForCli'.
> Cannot query the value of task ':radioplayer:generateSyntheticLinkageSwiftPMImportProjectForLinkageForCli' property 'syntheticImportProjectRoot' because it has no value available.

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

BUILD FAILED in 332ms
Configuration cache entry reused.