refactor(vtt-thumbnail): [PKG-VTT-THUMB-04] type runtime data and resource boundaries

packages/artplayer-plugin-vtt-thumbnail/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": { "allowJs": false },
+  "include": ["src/**/*.ts", "types/**/*.d.ts", "../../types/assets.d.ts", "../../test/types/vtt-thumbnail-runtime.ts"]
+}