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]>

feature/onboarding/build.gradle.kts

@@ -0,0 +1,7 @@
+plugins {
+    alias(libs.plugins.pixelwall.android.feature)
+}
+
+android {
+    namespace = "org.pixelwall.feature.onboarding"
+}

feature/onboarding/src/main/kotlin/org/pixelwall/feature/onboarding/OnboardingNavigation.kt

@@ -0,0 +1,17 @@
+package org.pixelwall.feature.onboarding
+
+import androidx.compose.ui.res.stringResource
+import androidx.navigation.NavGraphBuilder
+import androidx.navigation.compose.composable
+import org.pixelwall.core.ui.component.PlaceholderScreen
+
+const val ONBOARDING_ROUTE = "onboarding"
+
+fun NavGraphBuilder.onboardingScreen() {
+    composable(ONBOARDING_ROUTE) {
+        PlaceholderScreen(
+            title = stringResource(R.string.onboarding_title),
+            description = stringResource(R.string.onboarding_description),
+        )
+    }
+}

feature/onboarding/src/main/res/values-de/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="onboarding_title">Zugriffsstufen</string>
+    <string name="onboarding_description">Shizuku oder die ADB-Freigabe einrichten, um Änderungen freizuschalten.</string>
+</resources>

feature/onboarding/src/main/res/values/strings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="onboarding_title">Access levels</string>
+    <string name="onboarding_description">Set up Shizuku or the ADB grant to unlock changes.</string>
+</resources>