refactor: 重构文档处理流程和任务管理

common/task/consts.go

@@ -0,0 +1,30 @@
+package task
+
+// TaskType 任务类型枚举：文档解析的三个子任务
+type TaskType string
+
+const (
+	TaskTypeExtractKeywords TaskType = "EXTRACT_KEYWORDS" // 提取关键词
+	TaskTypeGenerateVector  TaskType = "GENERATE_VECTOR"  // 生成向量
+	TaskTypeFullTextSearch  TaskType = "FULL_TEXT_SEARCH" // 全文检索
+	TaskTypeDocParse        TaskType = "DOC_PARSE"        // 顶层文档解析总任务
+)
+
+// TaskStatus 任务状态枚举
+type TaskStatus string
+
+const (
+	TaskStatusPending   TaskStatus = "PENDING"   // 待执行
+	TaskStatusRunning   TaskStatus = "RUNNING"   // 执行中
+	TaskStatusCompleted TaskStatus = "COMPLETED" // 已完成
+	TaskStatusFailed    TaskStatus = "FAILED"    // 执行失败
+)
+
+// TaskPriority 任务优先级
+type TaskPriority int
+
+const (
+	TaskPriorityLow    TaskPriority = 1 // 低
+	TaskPriorityMedium TaskPriority = 2 // 中
+	TaskPriorityHigh   TaskPriority = 3 // 高
+)