feat: 版本号管理、构建日志持久化、App_Store 构建号自动递增

- 新增版本号配置 API（GET/PUT /api/config/versions）和前端管理界面
- 构建日志收集与保存：任务完成/取消/失败时写入 build.log
- 新增任务日志查询接口 GET /api/tasks/{task_id}/log
- App_Store 打包时自动递增 Build_Ver 第四位版本号
- 从 Provisioning Profile 自动提取 TEAM_ID 和 PROVISIONING_NAME
- 前端完成后支持查看完整构建日志

frontend/src/views/BuildView.vue

@@ -173,6 +173,27 @@ const fetchTaskDetail = async (taskId) => {
   }
 }
 
+const fetchBuildLog = async (taskId) => {
+  try {
+    const res = await fetch(`/api/tasks/${taskId}/log`)
+    if (res.ok) {
+      const data = await res.json()
+      if (data.log) {
+        const lines = data.log.split('\n').filter(Boolean)
+        logs.value = lines.map(line => {
+          const m = line.match(/^\[(.+?)\]\s+\[(.+?)\]\s+(.*)$/)
+          if (m) {
+            return { timestamp: m[1], level: m[2].toLowerCase(), message: m[3] }
+          }
+          return { timestamp: '', level: 'info', message: line }
+        })
+      }
+    }
+  } catch (e) {
+    // ignore
+  }
+}
+
 const connectWs = (taskId) => {
   if (activeWs) {
     activeWs.close()
@@ -215,6 +236,12 @@ const connectWs = (taskId) => {
       }
     }
   }
+  ws.onclose = () => {
+    // WebSocket 关闭后，尝试从服务器获取完整日志
+    if (logs.value.length === 0) {
+      fetchBuildLog(taskId)
+    }
+  }
 }
 
 watch(() => currentTaskId.value, (newId) => {
@@ -248,7 +275,10 @@ onMounted(async () => {
       // 已完成/失败的任务，直接显示结果
       if (task.status === 'completed' || task.status === 'failed' || task.status === 'cancelled') {
         completedTask.value = task
-        logs.value = [{ timestamp: task.completed_at || task.created_at, level: task.status === 'failed' ? 'error' : 'step', message: task.status === 'failed' ? `打包失败: ${task.error_message || ''}` : '打包完成' }]
+        await fetchBuildLog(queryTaskId)
+        if (!logs.value.length) {
+          logs.value = [{ timestamp: task.completed_at || task.created_at, level: task.status === 'failed' ? 'error' : 'step', message: task.status === 'failed' ? `打包失败: ${task.error_message || ''}` : '打包完成' }]
+        }
       }
       // 设置 currentTaskId（触发 watch → connectWs，用 flag 跳过）
       skipNextConnect = true