清理前端抠绿与 qwenSprite 死代码

- 删除无调用方的前端像素抠绿链（chromaKey.ts 及
  characterAssetWorkflowModel 中的视频采帧/抠绿函数）
- 删除已被 server-rs 提示词实现取代的 qwenSprite 共享骨架

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/components/asset-studio/characterAssetWorkflowModel.ts

@@ -1,4 +1,3 @@
-import { removeBackgroundFromRgba } from '../../../packages/shared/src/assets/chromaKey';
 import {
   AnimationState,
   type Character,
@@ -453,19 +452,6 @@ export function loadImageFromSource(source: string) {
   });
 }
 
-function loadVideoFromSource(source: string) {
-  return new Promise<HTMLVideoElement>((resolve, reject) => {
-    const video = document.createElement('video');
-    video.crossOrigin = 'anonymous';
-    video.preload = 'auto';
-    video.muted = true;
-    video.playsInline = true;
-    video.onloadeddata = () => resolve(video);
-    video.onerror = () => reject(new Error(`加载视频失败：${source}`));
-    video.src = source;
-  });
-}
-
 function createCanvas(width: number, height: number) {
   const canvas = document.createElement('canvas');
   canvas.width = width;
@@ -708,200 +694,6 @@ export async function buildAnimationClipFromMaster(
   } satisfies DraftAnimationClip;
 }
 
-function applyGreenScreenAlpha(
-  context: CanvasRenderingContext2D,
-  width: number,
-  height: number,
-) {
-  const imageData = context.getImageData(0, 0, width, height);
-  removeBackgroundFromRgba(imageData.data, width, height);
-
-  context.putImageData(imageData, 0, 0);
-}
-
-async function normalizeFrameSourceToDataUrl(
-  frameSource: string,
-  options: {
-    frameWidth: number;
-    frameHeight: number;
-    applyChromaKey: boolean;
-  },
-) {
-  const image = await loadImageFromSource(frameSource);
-  const { canvas, context } = createCanvas(
-    options.frameWidth,
-    options.frameHeight,
-  );
-  context.clearRect(0, 0, canvas.width, canvas.height);
-  drawContainedImage(context, image, {
-    width: canvas.width,
-    height: canvas.height,
-  });
-
-  if (options.applyChromaKey) {
-    applyGreenScreenAlpha(context, canvas.width, canvas.height);
-  }
-
-  return canvas.toDataURL('image/png');
-}
-
-export async function normalizeMasterVisualSourceToDataUrl(
-  source: string,
-  options: {
-    applyChromaKey?: boolean;
-  } = {},
-) {
-  const image = await loadImageFromSource(source);
-  const { canvas, context } = createCanvas(
-    MASTER_VISUAL_WIDTH,
-    MASTER_VISUAL_HEIGHT,
-  );
-  context.clearRect(0, 0, canvas.width, canvas.height);
-  drawContainedImage(context, image, {
-    width: canvas.width,
-    height: canvas.height,
-  });
-
-  if (options.applyChromaKey !== false) {
-    applyGreenScreenAlpha(context, canvas.width, canvas.height);
-  }
-
-  return {
-    dataUrl: canvas.toDataURL('image/png'),
-    width: canvas.width,
-    height: canvas.height,
-  };
-}
-
-function seekVideo(video: HTMLVideoElement, targetTime: number) {
-  return new Promise<void>((resolve, reject) => {
-    if (Math.abs(video.currentTime - targetTime) < 0.001) {
-      window.requestAnimationFrame(() => resolve());
-      return;
-    }
-
-    const handleSeeked = () => {
-      cleanup();
-      resolve();
-    };
-    const handleError = () => {
-      cleanup();
-      reject(new Error('视频定位失败'));
-    };
-    const cleanup = () => {
-      video.removeEventListener('seeked', handleSeeked);
-      video.removeEventListener('error', handleError);
-    };
-
-    video.addEventListener('seeked', handleSeeked, { once: true });
-    video.addEventListener('error', handleError, { once: true });
-    video.currentTime = Math.max(0, targetTime);
-  });
-}
-
-export async function buildAnimationClipFromImageSources(
-  sources: string[],
-  options: {
-    animation: AnimationState;
-    fps: number;
-    loop: boolean;
-    frameWidth?: number;
-    frameHeight?: number;
-    applyChromaKey?: boolean;
-  },
-) {
-  const frameWidth = options.frameWidth ?? GENERATED_FRAME_WIDTH;
-  const frameHeight = options.frameHeight ?? GENERATED_FRAME_HEIGHT;
-  const frames = await Promise.all(
-    sources.map((source) =>
-      normalizeFrameSourceToDataUrl(source, {
-        frameWidth,
-        frameHeight,
-        applyChromaKey: options.applyChromaKey ?? false,
-      }),
-    ),
-  );
-
-  return {
-    animation: options.animation,
-    frames,
-    fps: Math.max(1, options.fps),
-    loop: options.loop,
-    frameWidth,
-    frameHeight,
-  } satisfies DraftAnimationClip;
-}
-
-export async function buildAnimationClipFromVideoSource(
-  videoSource: string,
-  options: {
-    animation: AnimationState;
-    fps: number;
-    loop: boolean;
-    frameCount?: number;
-    frameWidth?: number;
-    frameHeight?: number;
-    applyChromaKey?: boolean;
-    sampleStartRatio?: number;
-    sampleEndRatio?: number;
-  },
-) {
-  const video = await loadVideoFromSource(videoSource);
-  const frameWidth = options.frameWidth ?? GENERATED_FRAME_WIDTH;
-  const frameHeight = options.frameHeight ?? GENERATED_FRAME_HEIGHT;
-  const duration =
-    Number.isFinite(video.duration) && video.duration > 0 ? video.duration : 1;
-  const derivedFrameCount = Math.max(
-    2,
-    options.frameCount ?? Math.round(duration * Math.max(1, options.fps)),
-  );
-  const sampleStartRatio = Math.min(
-    0.85,
-    Math.max(0, options.sampleStartRatio ?? 0),
-  );
-  const sampleEndRatio = Math.min(
-    1,
-    Math.max(sampleStartRatio + 0.05, options.sampleEndRatio ?? 1),
-  );
-  const sampleWindowDuration = duration * (sampleEndRatio - sampleStartRatio);
-  const { canvas, context } = createCanvas(frameWidth, frameHeight);
-  const frames: string[] = [];
-
-  for (let frameIndex = 0; frameIndex < derivedFrameCount; frameIndex += 1) {
-    const progress = options.loop
-      ? frameIndex / derivedFrameCount
-      : frameIndex / Math.max(1, derivedFrameCount - 1);
-    const targetTime = Math.min(
-      duration - 0.001,
-      duration * sampleStartRatio + sampleWindowDuration * progress,
-    );
-
-    await seekVideo(video, targetTime);
-
-    context.clearRect(0, 0, canvas.width, canvas.height);
-    drawContainedSource(context, video, video.videoWidth, video.videoHeight, {
-      width: canvas.width,
-      height: canvas.height,
-    });
-
-    if (options.applyChromaKey) {
-      applyGreenScreenAlpha(context, canvas.width, canvas.height);
-    }
-
-    frames.push(canvas.toDataURL('image/png'));
-  }
-
-  return {
-    animation: options.animation,
-    frames,
-    fps: Math.max(1, options.fps),
-    loop: options.loop,
-    frameWidth,
-    frameHeight,
-    previewVideoPath: videoSource,
-  } satisfies DraftAnimationClip;
-}
-
 async function buildReferenceVideoFromFrameSources(
   frameSources: string[],
   options: {