Add cxyz Android project structure and initial configuration

- Introduced a new Flutter project for the cxyz Android manga/comic reader, including essential files such as pubspec.yaml, AndroidManifest.xml, and Gradle configuration.
- Added .gitignore files to exclude unnecessary files and directories for both the main project and Android-specific files.
- Implemented initial README.md with project description, features, setup instructions, and API details for ComicLand, MangaRead, and MangaTown.
- Configured analysis options and dependencies in pubspec.yaml to support Flutter development.
- Established a pnpm workspace and lockfile for dependency management.
- Included various Android resources such as icons, styles, and launch backgrounds for a complete application setup.

cxyz-android/test/mangaread_catalog_test.dart

@@ -0,0 +1,27 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:cxyz_android/sources/mangaread/mangaread_source.dart';
+import 'package:cxyz_android/sources/source.dart';
+
+void main() {
+  test('latest pagination maps offset/limit to distinct site pages', () async {
+    final source = MangaReadSource();
+    final page1 = await source.loadCatalog(
+      CatalogMenuKind.latest,
+      offset: 0,
+      limit: 30,
+    );
+    final page2 = await source.loadCatalog(
+      CatalogMenuKind.latest,
+      offset: 30,
+      limit: 30,
+    );
+
+    expect(page1, isNotEmpty);
+    expect(page2, isNotEmpty);
+    expect(page1.first.slug, isNot(page2.first.slug));
+    final overlap = page1.map((c) => c.slug).toSet().intersection(
+          page2.map((c) => c.slug).toSet(),
+        );
+    expect(overlap, isEmpty);
+  }, timeout: const Timeout(Duration(seconds: 60)));
+}