fix: 审核同名配方流程优化

- 一模一样：提示忽略，确认后删除重复，从待审核消失
- 不一样：显示对比，改名后采纳 / 放弃（删除并从待审核消失）

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/RecipeManager.vue

@@ -1275,29 +1275,42 @@ async function approveRecipe(recipe) {
   const dup = recipeStore.recipes.find(r => r.name === recipe.name && r._id !== recipe._id)
   if (dup) {
     if (recipesIdentical(recipe, dup)) {
-      ui.showToast('公共配方库中已有一模一样的配方「' + recipe.name + '」，无需重复采纳')
+      // Identical — delete this duplicate silently
+      const ok = await showConfirm(`公共配方库中已有一模一样的配方「${recipe.name}」，忽略这条？`)
+      if (!ok) return
+      try {
+        await api(`/api/recipes/${recipe._id}/reject`, { method: 'POST', body: '{}' })
+        await recipeStore.loadRecipes()
+        ui.showToast('已忽略重复配方')
+      } catch { ui.showToast('操作失败') }
       return
     }
-    // Different content, show comparison
-    const msg = `公共配方库中已有同名配方「${recipe.name}」但内容不同：\n\n` +
+    // Different content
+    const msg = `已有同名配方「${recipe.name}」但内容不同：\n\n` +
       `已有：${formatIngsCompare(dup.ingredients)}\n` +
-      `新的：${formatIngsCompare(recipe.ingredients)}\n\n` +
-      `点击"采纳"直接采纳，或"改名"修改新配方名称后采纳`
-    const action = await showConfirm(msg, { okText: '采纳', cancelText: '改名' })
+      `新的：${formatIngsCompare(recipe.ingredients)}`
+    const action = await showConfirm(msg, { okText: '改名后采纳', cancelText: '放弃' })
     if (!action) {
-      // User wants to rename
-      const newName = await showPrompt('请输入新名称：', recipe.name)
-      if (!newName || !newName.trim()) return
+      // User chose to discard
       try {
-        await api(`/api/recipes/${recipe._id}`, {
-          method: 'PUT',
-          body: JSON.stringify({ name: newName.trim() }),
-        })
-        recipe.name = newName.trim()
-      } catch {
-        ui.showToast('改名失败')
-        return
-      }
+        await api(`/api/recipes/${recipe._id}/reject`, { method: 'POST', body: JSON.stringify({ reason: '与已有同名配方重复' }) })
+        await recipeStore.loadRecipes()
+        ui.showToast('已放弃')
+      } catch { ui.showToast('操作失败') }
+      return
+    }
+    // User wants to rename
+    const newName = await showPrompt('请输入新名称：', recipe.name)
+    if (!newName || !newName.trim()) return
+    try {
+      await api(`/api/recipes/${recipe._id}`, {
+        method: 'PUT',
+        body: JSON.stringify({ name: newName.trim() }),
+      })
+      recipe.name = newName.trim()
+    } catch {
+      ui.showToast('改名失败')
+      return
     }
   }
   try {