M2b: Android skeleton, :core:model contract, :domain passing all vectors

Gradle project in android/ with every module of SPEC §6.2 (build-logic convention plugins, version catalog,
architecture check in check), :core:model types and repository interfaces of §14.2.4 and §14.5, :domain
implementing §14.5.2 and §14.5.4 (125 vector cases), scenario-driven fakes with the empty scenario, Room 3
entities and KvittDatabase v1 with exported schema, :app shell with Hilt, en/sv strings with MissingTranslation
as a lint error, Roborazzi goldens of the empty screen in light and dark.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/data/build.gradle.kts

@@ -0,0 +1,18 @@
+// :data — Room database, Ktor client, sync engine and the real repositories (owned by M5). M2b ships the Room
+// entities of SPEC §14.2 and the database class with its exported schema (version 1), no DAOs.
+plugins {
+    id("kvitt.android.library")
+    alias(libs.plugins.ksp)
+    alias(libs.plugins.room3)
+}
+
+room3 {
+    schemaDirectory("$projectDir/schemas")
+}
+
+dependencies {
+    implementation(project(":core:model"))
+    implementation(project(":domain"))
+    implementation(libs.androidx.room3.runtime)
+    ksp(libs.androidx.room3.compiler)
+}