chore: add Dart/windows-only example project

examples/dart/cli_windows/.gitignore

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+# https://dart.dev/guides/libraries/private-files
+# Created by `dart pub`
+.dart_tool/

examples/dart/cli_windows/CHANGELOG.md

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+## 1.0.0
+
+- Initial version.

examples/dart/cli_windows/README.md

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+# Thermion Example - Dart/Windows-only (no Flutter)
+
+A (Windows-only) command-line application that renders into a window without Flutter.
+
+```
+dart --enable-experiment=native-assets bin\cli_windows.dart
+```

examples/dart/cli_windows/analysis_options.yaml

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+# This file configures the static analysis results for your project (errors,
+# warnings, and lints).
+#
+# This enables the 'recommended' set of lints from `package:lints`.
+# This set helps identify many issues that may lead to problems when running
+# or consuming Dart code, and enforces writing Dart using a single, idiomatic
+# style and format.
+#
+# If you want a smaller set of lints you can change this to specify
+# 'package:lints/core.yaml'. These are just the most critical lints
+# (the recommended set includes the core lints).
+# The core lints are also what is used by pub.dev for scoring packages.
+
+include: package:lints/recommended.yaml
+
+# Uncomment the following section to specify additional rules.
+
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**
+
+# For more information about the core and recommended set of lints, see
+# https://dart.dev/go/core-lints
+
+# For additional information about configuring this file, see
+# https://dart.dev/guides/language/analysis-options

examples/dart/cli_windows/bin/cli_windows.dart

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+import 'dart:ffi';
+import 'dart:io';
+
+import 'package:ffi/ffi.dart';
+// import 'package:thermion_dart/thermion_dart/thermion_viewer_ffi.dart';
+import 'package:thermion_dart/src/utils/src/dart_resources.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/src/thermion_viewer_ffi.dart';
+import 'package:thermion_dart/src/viewer/src/ffi/src/thermion_dart.g.dart';
+
+void main(List<String> arguments) async {
+  var lib = DynamicLibrary.open("thermion_windows.dll");
+  var createWindow = lib.lookupFunction<Int Function(Int width, Int height, Int left, Int top), int Function(int, int, int, int)>("create_thermion_window");
+  var update = lib.lookupFunction<Void Function(), void Function()>("update");
+  var hwnd = createWindow(500, 500, 0, 0);
+  update();
+
+  final resourceLoader = calloc<ResourceLoaderWrapper>(1);
+  
+  var loadToOut = NativeCallable<
+      Void Function(Pointer<Char>,
+          Pointer<ResourceBuffer>)>.listener(DartResourceLoader.loadResource);
+
+  resourceLoader.ref.loadToOut = loadToOut.nativeFunction;
+  var freeResource = NativeCallable<Void Function(ResourceBuffer)>.listener(
+      DartResourceLoader.freeResource);
+  resourceLoader.ref.freeResource = freeResource.nativeFunction;
+
+  var viewer = ThermionViewerFFI(
+    
+    resourceLoader: resourceLoader.cast<Void>());
+
+  await viewer.initialized;
+  var swapChain = await viewer.createSwapChain(hwnd);
+  var view = await viewer.getViewAt(0);
+  await view.updateViewport(500, 500);
+  
+  await view.setRenderable(true, swapChain);
+  
+  await viewer.setBackgroundColor(1.0, 0.0, 0.0, 1.0);
+
+  var skyboxPath = File("..\\..\\assets\\default_env_skybox.ktx").absolute;
+
+  await viewer.loadSkybox("file://${skyboxPath.uri.toFilePath(windows: true)}");
+  while(true) {
+    await viewer.render();
+    update();
+    await Future.delayed(Duration(milliseconds: 16));
+  }
+  
+
+  
+}

examples/dart/cli_windows/pubspec.yaml

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+name: cli_windows
+description: A sample command-line application with basic argument parsing.
+version: 0.0.1
+# repository: https://github.com/my_org/my_repo
+
+environment:
+  sdk: ^3.6.0-326.0.dev
+
+# Add regular dependencies here.
+dependencies:
+  args: ^2.5.0
+  thermion_dart:
+    path: F:\Projects\thermion\thermion_dart
+  ffi: ^2.1.3
+
+dev_dependencies:
+  lints: ^5.0.0
+  test: ^1.24.0