1. 实现前端删除饲喂计划

2. 修复后端delete接口bug

frontend/src/pages/FeedPlan.vue

@@ -130,12 +130,13 @@ export default {
       }
       
       try {
-        const response = await fetch(`/api/v1/feed/plan/delete/${planId}`, {
-          method: 'DELETE',
+        const response = await fetch('/api/v1/feed/plan/delete', {
+          method: 'POST',
           headers: {
             'Content-Type': 'application/json',
             'Authorization': 'Bearer ' + localStorage.getItem('authToken')
-          }
+          },
+          body: JSON.stringify({ id: planId })
         })
         
         const data = await response.json()
@@ -143,13 +144,13 @@ export default {
         if (response.ok && data.code === 0) {
           // 删除成功，重新加载列表
           await this.loadPlans()
-          alert('删除成功')
+          this.$message?.success('删除成功') || alert('删除成功')
         } else {
-          alert('删除失败: ' + data.message)
+          this.$message?.error('删除失败: ' + data.message) || alert('删除失败: ' + data.message)
         }
       } catch (error) {
         console.error('删除饲喂计划失败:', error)
-        alert('删除饲喂计划失败: ' + error.message)
+        this.$message?.error('删除饲喂计划失败: ' + error.message) || alert('删除饲喂计划失败: ' + error.message)
       }
     },