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/services/image_headers.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/painting.dart';
+import 'package:flutter_cache_manager/flutter_cache_manager.dart';
+
+/// Cache manager that attaches ComicLand CDN Referer/Origin headers.
+class HeaderCacheManager extends CacheManager {
+  HeaderCacheManager(this.headers)
+      : super(
+          Config(
+            'cxyzHeaderCache',
+            fileService: _HeaderHttpFileService(headers),
+          ),
+        );
+
+  final Map<String, String> headers;
+}
+
+class _HeaderHttpFileService extends HttpFileService {
+  _HeaderHttpFileService(this.headers);
+
+  final Map<String, String> headers;
+
+  @override
+  Future<FileServiceResponse> get(String url, {Map<String, String>? headers}) {
+    final merged = <String, String>{...this.headers, ...?headers};
+    return super.get(url, headers: merged);
+  }
+}
+
+ImageProvider headerNetworkImage(String url, Map<String, String> headers) {
+  return NetworkImage(url, headers: headers);
+}