feat: 添加活动时间选择器

src/pages/goods/goods/edit.vue

@@ -126,6 +126,18 @@
             </el-form-item>
           </el-col>
         </el-row>
+        <el-row :gutter="20">
+          <el-col :span="12">
+            <el-form-item label="活动时间">
+              <el-date-picker
+                v-model="ruleForm.spare.activity_time"
+                type="datetime"
+                placeholder="请选择活动时间"
+                value-format="yyyy-MM-dd HH:mm:ss">
+              </el-date-picker>
+            </el-form-item>
+          </el-col>
+        </el-row>
       </app-card>
     </el-form>
     <app-card v-show="stepActive === 2">