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/lib/ui/widgets/source_logo.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+import '../../sources/source.dart';
+
+/// Bundled source favicon from [SourceId.logoAsset].
+class SourceLogo extends StatelessWidget {
+  const SourceLogo({
+    super.key,
+    required this.sourceId,
+    this.size = 32,
+    this.borderRadius = 6,
+  });
+
+  final SourceId sourceId;
+  final double size;
+  final double borderRadius;
+
+  @override
+  Widget build(BuildContext context) {
+    return ClipRRect(
+      borderRadius: BorderRadius.circular(borderRadius),
+      child: Image.asset(
+        sourceId.logoAsset,
+        width: size,
+        height: size,
+        fit: BoxFit.cover,
+        errorBuilder: (context, error, stackTrace) => Icon(
+          Icons.public,
+          size: size * 0.75,
+        ),
+      ),
+    );
+  }
+}