feat: 新增引导式新手指引 (OnboardingTour) 组件，全站页面接入

src/features/digital-human/DigitalHumanPage.tsx

@@ -98,6 +98,10 @@ function DigitalHumanPage({
   activeTaskIdRef.current = activeTaskId;
   const keepaliveRestoredRef = useRef(false);
   const [isDragging, setIsDragging] = useState(false);
+  const imageInputRef = useRef<HTMLInputElement | null>(null);
+  const audioInputRef = useRef<HTMLInputElement | null>(null);
+  const canvasDragCounterRef = useRef(0);
+  const [isCanvasDragging, setIsCanvasDragging] = useState(false);
 
   useEffect(() => {
     return () => {
@@ -171,6 +175,39 @@ function DigitalHumanPage({
     }
   };
 
+  const handleCanvasDragOver = (e: DragEvent) => { e.preventDefault(); e.stopPropagation(); if (e.dataTransfer.types.includes("Files")) setIsCanvasDragging(true); };
+  const handleCanvasDragLeave = (e: DragEvent) => { e.preventDefault(); e.stopPropagation(); if (e.currentTarget === e.target || !e.currentTarget.contains(e.relatedTarget as Node)) setIsCanvasDragging(false); };
+  const handleCanvasDrop = (e: DragEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setIsCanvasDragging(false);
+    const file = e.dataTransfer.files[0];
+    if (!file) return;
+    if (file.type.startsWith("image/")) {
+      if (imagePreview) URL.revokeObjectURL(imagePreview);
+      setImageName(file.name);
+      setImageFile(file);
+      setImagePreview(URL.createObjectURL(file));
+      pushDebugEntry("选择图片", `${file.name} / ${file.type || "unknown"} / ${formatFileSize(file.size)}`);
+      setNotice(`已拖放参考图 ${file.name}`);
+    } else if (file.type.startsWith("audio/")) {
+      if (audioPreview) URL.revokeObjectURL(audioPreview);
+      setAudioName(file.name);
+      setAudioFile(file);
+      setAudioPreview(URL.createObjectURL(file));
+      pushDebugEntry("选择音频", `${file.name} / ${file.type || "unknown"} / ${formatFileSize(file.size)}`);
+      setNotice(`已拖放音频 ${file.name}`);
+    }
+  };
+
+  const handleCanvasClick = () => {
+    if (!imagePreview) {
+      imageInputRef.current?.click();
+    } else if (!audioPreview) {
+      audioInputRef.current?.click();
+    }
+  };
+
   const handleDownloadResult = async () => {
     if (!resultVideoUrl || isDownloadingResult) return;
     setIsDownloadingResult(true);
@@ -463,6 +500,7 @@ function DigitalHumanPage({
               <div className="studio-panel__section-body">
                 <label className={imageName ? "studio-upload-slot--filled" : "studio-upload-slot--empty"}>
                   <input
+                    ref={imageInputRef}
                     type="file"
                     accept="image/*"
                     onChange={(event) => {
@@ -501,6 +539,7 @@ function DigitalHumanPage({
               <div className="studio-panel__section-body">
                 <label className={audioName ? "studio-upload-slot--filled" : "studio-upload-slot--empty"}>
                   <input
+                    ref={audioInputRef}
                     type="file"
                     accept="audio/*"
                     onChange={(event) => {
@@ -541,12 +580,21 @@ function DigitalHumanPage({
               <img src={imagePreview} alt="参考人像" />
             </div>
           ) : (
-            <div className="studio-canvas-ghost">
+            <div
+              className={`studio-canvas-ghost${isCanvasDragging ? " is-dragging" : ""}`}
+              onClick={handleCanvasClick}
+              onDragOver={handleCanvasDragOver}
+              onDragLeave={handleCanvasDragLeave}
+              onDrop={handleCanvasDrop}
+              role="button"
+              tabIndex={0}
+              onKeyDown={(e) => { if (e.key === "Enter" || e.key === " ") handleCanvasClick(); }}
+            >
               <div className="studio-canvas-ghost__icon">
                 <CustomerServiceOutlined />
               </div>
               <div className="studio-canvas-ghost__title">上传参考人像与音频</div>
-              <div className="studio-canvas-ghost__hint">网页端首版只做本地预览，正式生成仍会继续走服务端队列。</div>
+              <div className="studio-canvas-ghost__hint">点击或拖拽上传；支持图片 (PNG/JPG/WEBP) 和音频 (MP3/WAV/M4A)</div>
             </div>
           )
         }