Update upload hint text to explicitly indicate image upload

- Change 'Click or drag to upload' to 'Click or drag to upload image'
- Update translation key in PublishTool.vue and PublishApp.vue
- Add new translation entry in zh-CN.json
- Improve user clarity by explicitly stating image upload requirement

apps/jingrow/frontend/src/locales/zh-CN.json

@@ -995,7 +995,8 @@
   "App name": "应用名称",
   "Repository URL": "仓库地址",
   "Drop image here": "拖拽图片到此处",
-  "Click or drag to upload": "点击或拖拽上传",
+  "Click or drag to upload": "点击或拖拽上传图片",
+  "Click or drag to upload image": "点击或拖拽上传图片",
   "Remove": "删除",
   "Sort by": "排序方式",
   "Latest": "最新",

apps/jingrow/frontend/src/views/dev/PublishApp.vue

@@ -59,7 +59,7 @@
                 </div>
                 <div v-else class="placeholder-image">
                   <n-icon size="80"><Icon icon="tabler:apps" /></n-icon>
-                  <p class="upload-hint">{{ t('Click or drag to upload') }}</p>
+                  <p class="upload-hint">{{ t('Click or drag to upload image') }}</p>
                 </div>
                 <div v-if="isDragOver" class="drag-overlay">
                   <n-icon size="60"><Icon icon="tabler:upload" /></n-icon>

apps/jingrow/frontend/src/views/dev/PublishTool.vue

@@ -59,7 +59,7 @@
                 </div>
                 <div v-else class="placeholder-image">
                   <n-icon size="80"><Icon icon="tabler:tool" /></n-icon>
-                  <p class="upload-hint">{{ t('Click or drag to upload') }}</p>
+                  <p class="upload-hint">{{ t('Click or drag to upload image') }}</p>
                 </div>
                 <div v-if="isDragOver" class="drag-overlay">
                   <n-icon size="60"><Icon icon="tabler:upload" /></n-icon>