fix: 原价成本→单买成本，导出简版加可做次数和单买成本列

页面: 原价成本改为单买成本
导出简版: 配方名+可做次数+套装成本+单买成本+售价+利润率
导出完整版: 增加可做次数列，原价成本→单买成本

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

frontend/src/views/KitExport.vue

@@ -41,7 +41,7 @@
             <th class="th-name">配方名</th>
             <th class="th-times">可做次数</th>
             <th class="th-cost">套装成本</th>
-            <th class="th-cost">原价成本</th>
+            <th class="th-cost">单买成本</th>
             <th class="th-price">售价</th>
             <th class="th-profit">利润率</th>
           </tr>
@@ -238,15 +238,15 @@ async function exportExcel(mode) {
     const ws = wb.addWorksheet(ka.name)
 
     // Kit info header
-    ws.mergeCells('A1:F1')
+    ws.mergeCells(mode === 'full' ? 'A1:H1' : 'A1:F1')
     const titleCell = ws.getCell('A1')
     titleCell.value = `${ka.name} — ¥${ka.price} — ${ka.oils.length}种精油 — 可做${ka.recipeCount}个配方`
     titleCell.font = { bold: true, size: 13 }
     titleCell.alignment = { horizontal: 'center' }
 
     if (mode === 'full') {
-      // Full version: recipe name, tags, ingredients detail, kit cost, original cost, selling price, margin
+      // Full version: recipe name, tags, ingredients, times, kit cost, original cost, selling price, margin
-      const headers = ['配方名', '标签', '精油成分', '套装成本', '原价成本', '售价', '利润率']
+      const headers = ['配方名', '标签', '精油成分', '可做次数', '套装成本', '单买成本', '售价', '利润率']
       const headerRow = ws.addRow(headers)
       applyHeaderStyle(headerRow)
 
@@ -261,6 +261,7 @@ async function exportExcel(mode) {
           r.name,
           (r.tags || []).join('/'),
           ingredientStr,
+          calcMaxTimes(r),
           Number(r.kitCost.toFixed(2)),
           Number(r.originalCost.toFixed(2)),
           price || '',
@@ -268,8 +269,8 @@ async function exportExcel(mode) {
         ])
       }
     } else {
-      // Simple version: recipe name, kit cost, selling price, margin
+      // Simple version: recipe name, times, kit cost, original cost, selling price, margin
-      const headers = ['配方名', '套装成本', '售价', '利润率']
+      const headers = ['配方名', '可做次数', '套装成本', '单买成本', '售价', '利润率']
       const headerRow = ws.addRow(headers)
       applyHeaderStyle(headerRow)
 
@@ -278,7 +279,9 @@ async function exportExcel(mode) {
         const margin = calcMargin(r.kitCost, price)
         ws.addRow([
           r.name,
+          calcMaxTimes(r),
           Number(r.kitCost.toFixed(2)),
+          Number(r.originalCost.toFixed(2)),
           price || '',
           price ? `${margin.toFixed(1)}%` : '',
         ])