fix: explain digital human frame templates

src/web/index.css

@@ -14232,6 +14232,24 @@ textarea {
   font-size: 13px;
 }
 
+.digital-human-template-hint {
+  display: grid;
+  gap: 4px;
+  padding: 10px 11px;
+  border: 1px solid color-mix(in srgb, var(--color-primary) 24%, var(--color-border-light));
+  border-radius: var(--radius-sm);
+  background: color-mix(in srgb, var(--color-primary) 7%, var(--color-bg-card));
+  color: var(--color-text-muted);
+  font-size: 12px;
+  line-height: 1.5;
+}
+
+.digital-human-template-hint strong {
+  color: var(--color-text-primary);
+  font-size: 12px;
+  font-weight: 800;
+}
+
 .digital-human-workflow-upload-grid {
   display: grid;
   gap: 8px;

src/web/pages/DigitalHuman.tsx

@@ -1330,6 +1330,10 @@ export default function DigitalHuman() {
               <h3>分镜模板</h3>
               <p>模板决定最终画面排版，尺寸会传给 Pixelle 合成链路。</p>
             </div>
+            <div className="digital-human-template-hint">
+              <strong>模板不是模型</strong>
+              <span>image 适合图文分镜，static 适合纯文字卡片，video 适合数字人/视频画面；括号里的尺寸就是最终画布比例。</span>
+            </div>
             <label className="digital-human-field">
               <span>视频模板</span>
               <select value={frameTemplate} onChange={(event) => setFrameTemplate(event.target.value)}>