Set up project skeleton (milestone 1)

- Architecture and feature overview in docs/ARCHITECTURE.md
- Gradle 9.8 / AGP 9.4 / Kotlin 2.4 with version catalog and convention plugins
- Modules :app, :core:*, :device-profiles, :feature:* (placeholder screens)
- Flavors core (no INTERNET, enforced by a build check) and full
- Material You theme, navigation, expert mode and dry-run settings (DataStore)
- Pixel 8-10 device detection, unit tests, GPLv3 license, English README with Obtainium badge

Co-Authored-By: Claude Opus 5.5 <[email protected]>

core/domain/build.gradle.kts

@@ -0,0 +1,9 @@
+plugins {
+    alias(libs.plugins.pixelwall.jvm.library)
+}
+
+dependencies {
+    api(project(":core:model"))
+    implementation(libs.kotlinx.coroutines.core)
+    implementation(libs.javax.inject)
+}

core/domain/src/main/kotlin/org/pixelwall/core/domain/DeviceInfoProvider.kt

@@ -0,0 +1,7 @@
+package org.pixelwall.core.domain
+
+import org.pixelwall.core.model.DeviceInfo
+
+fun interface DeviceInfoProvider {
+    fun current(): DeviceInfo
+}

core/domain/src/main/kotlin/org/pixelwall/core/domain/UserPreferences.kt

@@ -0,0 +1,16 @@
+package org.pixelwall.core.domain
+
+import kotlinx.coroutines.flow.Flow
+
+data class UserPreferences(
+    /** Zeigt rohe Settings-Keys und Shell-Befehle an. */
+    val expertMode: Boolean = false,
+    /** Änderungen werden nur angezeigt, nie ausgeführt. */
+    val dryRun: Boolean = false,
+)
+
+interface UserPreferencesRepository {
+    val preferences: Flow<UserPreferences>
+    suspend fun setExpertMode(enabled: Boolean)
+    suspend fun setDryRun(enabled: Boolean)
+}