fix(knowledge): clarify image ocr availability

frontend/src/views/knowledge/processing.vue

@@ -178,7 +178,7 @@
             <label :class="displayOverview.rules.imageOcrEnabled ? '' : 'rule-item-disabled'">
               <span :class="displayOverview.rules.imageOcrEnabled ? '' : 'rule-label-muted'">
                 图片 OCR
-                <el-tag v-if="!displayOverview.rules.imageOcrEnabled" size="small" type="info" class="coming-soon-tag">即将支持</el-tag>
+                <el-tag v-if="!displayOverview.rules.imageOcrEnabled" size="small" type="info" class="rule-status-tag">未配置视觉模型</el-tag>
               </span>
               <el-switch
                 :model-value="displayOverview.rules.imageOcrEnabled"
@@ -1235,7 +1235,7 @@ function fileBadgeClass(type: string) {
   color: #94a3b8;
 }
 
-.coming-soon-tag {
+.rule-status-tag {
   font-size: 11px;
   padding: 0 5px;
   height: 18px;