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

src/features/script-tokens/ScriptTokensPage.tsx

@@ -679,14 +679,23 @@ function ScriptTokensPage() {
               </div>
             ) : !result && (
               <div className="script-eval-v5-input-section">
-                <div className="script-eval-v5-illustration" aria-label="上传剧本并开始评测">
+                <div className={`script-eval-v5-illustration${isDragging ? " is-dragging" : ""}`} aria-label="上传剧本并开始评测">
                   <div
                     className="script-eval-v5-illustration-hit"
                     role="button"
                     tabIndex={0}
                     onClick={() => fileInputRef.current?.click()}
                     onKeyDown={uploadKeyDown}
+                    onDragOver={handleDragOver}
+                    onDragLeave={handleDragLeave}
+                    onDrop={handleDrop}
                   >
+                    {isDragging && (
+                      <div className="script-eval-v5-upload-drop-overlay">
+                        <UploadOutlined />
+                        <span>释放文件以上传</span>
+                      </div>
+                    )}
                     <div className="script-eval-v5-upload-card-icon">
                       <ShellIcon name="file-text" />
                     </div>