fix(budget): 版本管理UI字段/状态机对齐 active→draft映射+plan_count/last_updated别名

- list_budget_versions 输出 approval_status(active映射draft)+plan_count+last_updated
- 保留 status/kpi_count/updated_at 原字段兼容（下拉'当前'标记/测试契约）
- 前端提交审批按钮兜底 active（双端保险）
- 修复: 版本行仅复选框无按钮/状态恒草稿/条目数空白/最后更新空白

backend/app/api/budget.py

@@ -1435,14 +1435,23 @@ def list_budget_versions(
 
     result = []
     for key, v in version_map.items():
+        raw_status = v["status"]
+        # 状态机对齐（2026-09-07 UI修复）：DB 默认态是 active（当前在用/草稿态），
+        # 前端审批按钮语义用 draft=可提交审批/submitted=待审批/approved=已批准只读/rejected=已驳回
+        # → approval_status 把 active 映射为 draft，同时保留 status 原字段兼容其他引用（下拉"当前"标记等）
+        approval_status = "draft" if raw_status == "active" else raw_status
+        updated_str = v["updated_at"].strftime("%Y-%m-%d %H:%M") if v["updated_at"] else ""
         result.append({
             "version": v["version"],
-            "status": v["status"],
+            "status": raw_status,
+            "approval_status": approval_status,
             "kpi_count": v["kpi_count"],
+            "plan_count": v["kpi_count"],  # 前端列 prop 别名（BudgetManagement.vue versions tab）
             "total_budget": round(v["total_budget"], 2),
             "period_count": len(v["periods"]),
             "year": year,
-            "updated_at": v["updated_at"].strftime("%Y-%m-%d %H:%M") if v["updated_at"] else "",
+            "updated_at": updated_str,
+            "last_updated": updated_str,   # 前端列 prop 别名
         })
     result.sort(key=lambda x: x["version"], reverse=True)
     return result

frontend/src/views/BudgetManagement.vue

@@ -166,7 +166,7 @@
           <el-table-column prop="last_updated" label="最后更新" min-width="150" />
           <el-table-column label="操作" width="200" fixed="right">
             <template #default="{ row }">
-              <el-button v-if="row.approval_status === 'draft'" size="small" @click="submitVersion(row)">提交审批</el-button>
+              <el-button v-if="row.approval_status === 'draft' || row.approval_status === 'active'" size="small" @click="submitVersion(row)">提交审批</el-button>
               <template v-if="row.approval_status === 'submitted'"><el-button size="small" type="success" @click="approveVersion(row, 'approved')">批准</el-button><el-button size="small" type="danger" @click="approveVersion(row, 'rejected')">驳回</el-button></template>
               <el-button v-if="row.approval_status === 'rejected'" size="small" @click="resubmitVersion(row)">重新提交</el-button>
               <el-checkbox v-model="row._selected" @change="onVersionSelect(row)" :disabled="selectedVersions.length >= 2 && !row._selected" style="margin-left:8px;" />