feat: 5项UX优化 - 合并占位符prompt、默认200x200尺寸、系统默认设置、签名状态列、素材预加载前置

src/pages/Login.tsx

@@ -46,6 +46,21 @@ export default function Login() {
         storage.set('formFieldsConfig', DEFAULT_FORM_FIELDS);
       }
 
+      const savedAssets = storage.get<{id: string; name: string; dataUrl: string}[]>('imageAssets', []);
+      if (savedAssets.length === 0) {
+        fetch('/logo_square.png')
+          .then(res => res.blob())
+          .then(blob => {
+            const reader = new FileReader();
+            reader.onloadend = () => {
+              const dataUrl = reader.result as string;
+              storage.set('imageAssets', [{ id: 'asset_logo', name: '医院Logo', dataUrl }]);
+            };
+            reader.readAsDataURL(blob);
+          })
+          .catch(() => {});
+      }
+
       const settingsRaw = storage.get<SystemSettings>('systemSettings', {} as SystemSettings);
       if (!settingsRaw.frameCount) {
         const round1 = (n: number) => Math.round(n * 10) / 10;
@@ -59,7 +74,10 @@ export default function Login() {
           apiEndpoint: '',
           apiKey: '',
           defaultTemplate: savedTemplates[0]?.id || '',
-          frameMode: 'uniform'
+          frameMode: 'uniform',
+          autoInsertFrames: true,
+          autoInsertDelay: 1,
+          autoInsertFrameIndices: [0, 1, 2, 3, 4, 5]
         };
         storage.set('systemSettings', defaultSettings);
       }