fix: CI 切换到 MSVC 工具链、添加 eslint.config.js

- Rust: windows-latest 默认 MSVC，无需额外安装 GNU/MinGW
- ESLint: 添加 eslint flat config（js + tseslint + react-hooks）

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

eslint.config.js

@@ -0,0 +1,24 @@
+import js from '@eslint/js';
+import tseslint from 'typescript-eslint';
+import reactHooks from 'eslint-plugin-react-hooks';
+import reactRefresh from 'eslint-plugin-react-refresh';
+import globals from 'globals';
+
+export default tseslint.config(
+  { ignores: ['dist', 'src-tauri'] },
+  {
+    extends: [js.configs.recommended, ...tseslint.configs.recommended],
+    files: ['**/*.{ts,tsx}'],
+    languageOptions: {
+      globals: globals.browser,
+    },
+    plugins: {
+      'react-hooks': reactHooks,
+      'react-refresh': reactRefresh,
+    },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      'react-refresh/only-export-components': ['warn', { allowConstantExport: true }],
+    },
+  },
+);