添加形状显示开关，修改默认参数

src/views/particle-panel/EmissionSection.vue

@@ -120,6 +120,10 @@
             <NumSlider label="基准角度" :min="-360" :max="360" :step="1" v-model="sys.config.direction" />
             <NumSlider label="随机范围" :min="0" :max="360" :step="1" v-model="sys.config.spread" />
           </template>
+          <label v-if="sys.config.shape !== 'point'" class="switch-row">
+            <input type="checkbox" v-model="sys.config.showShape" />
+            <span class="switch-ui"></span><span>显示形状</span>
+          </label>
         </div>
       </div>
 </template>