fix: 套装方案对比按钮移到商业header区域，与项目列表分开

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

frontend/src/views/Projects.vue

@@ -4,13 +4,13 @@
     <div class="commercial-header">
       <div class="commercial-icon">💼</div>
       <div class="commercial-desc">商业用户专属功能，包含项目核算、成本分析等工具</div>
+      <button class="btn-kit-compare" @click="handleKitExport">📦 套装方案对比</button>
     </div>
 
     <!-- Project List -->
     <div class="toolbar-sticky">
       <div class="toolbar-inner">
         <h3 class="page-title">📊 服务项目成本利润分析</h3>
-        <button class="btn-kit-compare" @click="handleKitExport">📦 套装方案对比</button>
         <button class="btn-primary btn-sm" @click="handleCreateProject">+ 新增项目</button>
       </div>
     </div>
@@ -876,12 +876,14 @@ function formatDate(d) {
 }
 
 .btn-kit-compare {
+  display: inline-block;
+  margin-top: 12px;
   background: linear-gradient(135deg, #f0e6d3 0%, #e8d5b8 100%);
   color: #7a6540;
   border: 1.5px solid #d4c4a0;
   border-radius: 10px;
-  padding: 6px 14px;
-  font-size: 12px;
+  padding: 8px 20px;
+  font-size: 13px;
   cursor: pointer;
   font-family: inherit;
   font-weight: 500;