feat: 优惠管理合并重构与商品续费价格参数

- 合并优惠码/代金券为商品管理下优惠管理页面，卡片化展示与过期遮罩

- 用户组新增优惠绑定，商品关联改用懒加载树选择器

- 商品/套餐表单新增 renew_price、renew_recommend_rebate、renew_fixed_price

Co-authored-by: Cursor <cursoragent@cursor.com>

src/views/product/ProductGroup.vue

@@ -637,6 +637,20 @@
                   inactive-text="禁止"
                 />
               </el-form-item>
+              <el-form-item prop="renew_price" v-if="productForm.can_renew">
+                <template #label>
+                  <span>续费价格<span class="unit-suffix">（元，0 沿用商品价格）</span></span>
+                </template>
+                <el-input-number
+                  v-model="productForm.renew_price"
+                  :min="0"
+                  :precision="2"
+                  :step="0.01"
+                  placeholder="续费基础价格"
+                  controls-position="right"
+                  style="width: 100%"
+                />
+              </el-form-item>
               <el-form-item label="购买类型" prop="arg_type">
                 <el-select
                   v-model="productForm.arg_type"
@@ -723,6 +737,20 @@
                   style="width: 100%"
                 />
               </el-form-item>
+              <el-form-item prop="renew_recommend_rebate">
+                <template #label>
+                  <span>续费推介返还<span class="unit-suffix">（%，0 沿用推荐返还）</span></span>
+                </template>
+                <el-input-number
+                  v-model="productForm.renew_recommend_rebate"
+                  :min="0"
+                  :max="100"
+                  :disabled="!productForm.recommend"
+                  placeholder="续费推介返还百分比"
+                  controls-position="right"
+                  style="width: 100%"
+                />
+              </el-form-item>
               <el-form-item label="购买通知" prop="send_notice">
                 <el-switch
                   v-model="productForm.send_notice"
@@ -903,7 +931,9 @@ const productForm = reactive({
   require_real_name: false,
   sold_out: false,
   max_per_user: 0,
-  send_notice: false
+  send_notice: false,
+  renew_price: 0,
+  renew_recommend_rebate: 0
 })
 
 const productRules = {
@@ -1591,7 +1621,9 @@ const handleEditProduct = (product, parentGroupId) => {
     require_real_name: product.requireRealName ?? product.require_real_name ?? false,
     sold_out: !!product.soldOut,
     max_per_user: product.maxPerUser ?? product.max_per_user ?? 0,
-    send_notice: !!product.sendNotice
+    send_notice: !!product.sendNotice,
+    renew_price: (product.renewPrice ?? product.renew_price ?? 0) / 100,
+    renew_recommend_rebate: product.renewRecommendRebate ?? product.renew_recommend_rebate ?? 0
   })
   
   productDialogVisible.value = true
@@ -1620,7 +1652,9 @@ const submitProductForm = () => {
           require_real_name: productForm.require_real_name,
           sold_out: productForm.sold_out === true,
           max_per_user: Number(productForm.max_per_user) || 0,
-          send_notice: productForm.send_notice === true
+          send_notice: productForm.send_notice === true,
+          renew_price: Number(productForm.renew_price) || 0,
+          renew_recommend_rebate: Number(productForm.renew_recommend_rebate) || 0
         }
         
         let res

src/views/product/components/ProductPlanManager.vue

@@ -274,6 +274,13 @@
             <span class="unit-text">元</span>
           </div>
         </el-form-item>
+        <el-form-item label="续费固定价格" prop="renew_fixed_price" v-if="planForm.enable_fixed_price === true">
+          <div class="unit-input-row">
+            <el-input-number v-model="planForm.renew_fixed_price" :min="0" :precision="2" :step="0.01" style="flex:1" placeholder="0 表示沿用固定价格" />
+            <span class="unit-text">元</span>
+          </div>
+          <div class="form-tip">续费时使用的固定价格，为 0 时沿用上方固定价格</div>
+        </el-form-item>
         <el-form-item label="排序索引" prop="index">
           <el-input-number v-model="planForm.index" :min="0" style="width: 100%" />
         </el-form-item>
@@ -386,7 +393,8 @@ const planForm = reactive({
   disable: false,
   show_home: false,
   can_update: false,
-  max_per_user: 0
+  max_per_user: 0,
+  renew_fixed_price: 0
 })
 const planFormRules = {
   name: [{ required: true, message: '请输入套餐名称', trigger: 'blur' }]
@@ -794,7 +802,8 @@ const handleEditPlan = async (row) => {
         enable_fixed_price: !!(data.enableFixedPrice || data.enable_fixed_price),
         index: data.index || 0, disable: data.disable || false, show_home: !!(data.showHome || data.show_home),
         can_update: !!(data.canUpdate || data.can_update),
-        max_per_user: data.maxPerUser ?? data.max_per_user ?? 0
+        max_per_user: data.maxPerUser ?? data.max_per_user ?? 0,
+        renew_fixed_price: ((data.renewFixedPrice ?? data.renew_fixed_price ?? 0) / 100).toFixed(2) * 1
       })
       initSelectedArgsFromJson(data.args, extraArgIdsArray)
       planFormDialogVisible.value = true
@@ -852,7 +861,8 @@ const submitPlanForm = () => {
           inventory: Number(planForm.inventory) || 0, fixed_price: Math.round(Number(planForm.fixed_price) * 100) || 0,
           index: Number(planForm.index) || 0, show_home: planForm.show_home === true,
           can_update: planForm.can_update === true,
-          max_per_user: Number(planForm.max_per_user) || 0
+          max_per_user: Number(planForm.max_per_user) || 0,
+          renew_fixed_price: Math.round(Number(planForm.renew_fixed_price) * 100) || 0
         }
         if (planFormType.value === 'add') submitData.enable_fixed_price = planForm.enable_fixed_price === true
         let res