feat: add Android live wallpaper native module

WallpaperService with OpenGL ES 2.0 rendering, 6 GLSL
fragment shaders, gyroscope integration, frame capping at
24fps with visibility-based pause. Expo Module API bridge
for config persistence and system wallpaper picker launch.

modules/wallpaper-android/expo-module.config.json

@@ -0,0 +1,6 @@
+{
+  "platforms": ["android"],
+  "android": {
+    "modules": ["com.lively.wallpaper.WallpaperAndroidModule"]
+  }
+}

modules/wallpaper-android/src/WallpaperAndroidModule.ts

@@ -0,0 +1,11 @@
+import { requireNativeModule } from "expo-modules-core";
+
+interface WallpaperAndroidInterface {
+  saveConfig(configJson: string): Promise<void>;
+  setLiveWallpaper(): Promise<void>;
+  isLiveWallpaperSupported(): boolean;
+  getCurrentConfig(): string | null;
+}
+
+export const WallpaperAndroid =
+  requireNativeModule<WallpaperAndroidInterface>("WallpaperAndroid");