feat(manager): 图片组件选择模式只保留热区

- 移除链接/热区单选，新增图片组件默认 hotzone 直接进绘制热区
- 链接区标题随模式显示热区/选择链接
- 存量 link 数据不受影响（uniapp 端热区由 tpl_hot_zone 渲染；原生小程序暂无热区渲染，待补）

manager/src/views/page-decoration/wap/config.js

@@ -26,7 +26,7 @@ export const modelData = [
           url: "",
           link: "",
           size: "750*280",
-          model: "link"
+          model: "hotzone"
         }
       ]
     }

manager/src/views/page-decoration/wap/decorate.vue

@@ -389,19 +389,8 @@
 
           <!-- 填写链接 -->
 
-          <div class="decorate-view" v-if="res.onlyImg">
-            <div class="decorate-view-title">选择模式</div>
-
-            <div>
-              <el-radio-group v-model="item.model">
-                <el-radio value="link">链接</el-radio>
-                <el-radio value="hotzone">热区</el-radio>
-              </el-radio-group>
-            </div>
-          </div>
-
           <div class="decorate-view" v-if="!res.notLink">
-            <div class="decorate-view-title">选择链接</div>
+            <div class="decorate-view-title">{{ item.model === "hotzone" ? "热区" : "选择链接" }}</div>
             <div
               v-if="item.url && item.url.length != 0"
               class="decorate-view-link"