chore: 删除不再使用的 TypeScript 声明文件，并添加新的插件声明文件

docs/assets/ts/artplayer-plugin-danmuku-mask.d.ts

@@ -0,0 +1,25 @@
+import type Artplayer from 'artplayer';
+
+export = artplayerPluginDanmukuMask;
+export as namespace artplayerPluginDanmukuMask;
+
+type Option = {
+    solutionPath?: string;
+    modelSelection?: number;
+    smoothSegmentation?: boolean;
+    minDetectionConfidence?: number;
+    minTrackingConfidence?: number;
+    selfieMode?: boolean;
+    drawContour?: boolean;
+    foregroundThreshold?: number;
+    opacity?: number;
+    maskBlurAmount?: number;
+};
+
+type Result = {
+    name: 'artplayerPluginDanmukuMask';
+    start: () => Promise<void>;
+    stop: () => void;
+};
+
+declare const artplayerPluginDanmukuMask: (option?: Option) => (art: Artplayer) => Result;