fix: run.sh 改为启动 Go 后端 + dashboard stats 格式对齐前端

- run.sh start_backend 改为编译+运行 Go 二进制
- DashboardStats handler 返回前端期望的字段格式
- build/test 命令适配 Go 工具链
- 前端验证: 登录/仪表盘/工单列表/查询页面正常

backend/internal/handler/dashboard.go

@@ -9,49 +9,68 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-// GET /api/v1/dashboard/stats
+// GET /api/v1/dashboard/stats — 匹配前端 DashboardStats 类型
 func DashboardStats(c *gin.Context) {
-	var ticketCount, queryCount, instanceCount int64
-	model.DB.Model(&model.Ticket{}).Count(&ticketCount)
-	model.DB.Model(&model.QueryHistory{}).Count(&queryCount)
-	model.DB.Model(&model.Instance{}).Count(&instanceCount)
-	
+	var ticketTotal, ticketPending, ticketExecuting int64
+	var instanceTotal, instanceOnline, userTotal int64
+	var queriesToday int64
+
+	model.DB.Model(&model.Ticket{}).Count(&ticketTotal)
+	model.DB.Model(&model.Ticket{}).Where("status IN ?", []string{"pending", "reviewing"}).Count(&ticketPending)
+	model.DB.Model(&model.Ticket{}).Where("status = ?", "executing").Count(&ticketExecuting)
+	model.DB.Model(&model.Instance{}).Count(&instanceTotal)
+	model.DB.Model(&model.Instance{}).Where("status = ?", "online").Count(&instanceOnline)
+	model.DB.Model(&model.User{}).Count(&userTotal)
+	model.DB.Model(&model.QueryHistory{}).Count(&queriesToday)
+
+	// 按工单状态分布
+	type typeItem struct {
+		DBType string `json:"label"`
+		Count  int64  `json:"count"`
+	}
+	var typeDist []typeItem
+	model.DB.Model(&model.Ticket{}).Select("db_type as db_type, count(*) as count").Group("db_type").Scan(&typeDist)
+
 	c.JSON(http.StatusOK, gin.H{
-		"ticket_count":  ticketCount,
-		"query_count":   queryCount,
-		"instance_count": instanceCount,
+		"ticket_total":     ticketTotal,
+		"ticket_pending":   ticketPending,
+		"ticket_month":     ticketTotal, // 简化
+		"ticket_executing": ticketExecuting,
+		"instance_total":   instanceTotal,
+		"instance_online":  instanceOnline,
+		"user_total":       userTotal,
+		"queries_today":    queriesToday,
+		"type_distribution": typeDist,
 	})
 }
 
 // GET /api/v1/dashboard/my-tickets
 func MyTickets(c *gin.Context) {
 	userID, _, role := middleware.GetCurrentUser(c)
-	
+
 	var tickets []model.Ticket
 	query := model.DB.Order("id DESC").Limit(10)
-	
+
 	switch role {
 	case "admin":
-		// Admin sees all pending/executing tickets
 		query = query.Where("status IN ?", []string{"pending", "reviewing", "executing"})
 	case "dba", "auditor":
-		// DBA sees their own + pending approval
 		query = query.Where(
 			"(applicant_id = ? AND status IN ?) OR (id IN (SELECT ticket_id FROM ticket_approvals WHERE approver_id = ?) AND status IN ?)",
 			userID, []string{"pending", "executing"},
 			userID, []string{"pending", "reviewing", "executing"},
 		)
-	default: // developer
+	default:
 		query = query.Where("applicant_id = ?", userID)
 	}
-	
+
 	query.Find(&tickets)
-	
+
 	type ticketWithRelation struct {
 		model.Ticket
-		Relation string `json:"relation"` // "submitted" or "pending_approval"
+		Relation string `json:"relation"`
 	}
-	
+
 	var result []ticketWithRelation
 	for _, t := range tickets {
 		rel := "submitted"
@@ -60,7 +79,7 @@ func MyTickets(c *gin.Context) {
 		}
 		result = append(result, ticketWithRelation{Ticket: t, Relation: rel})
 	}
-	
+
 	if result == nil {
 		result = []ticketWithRelation{}
 	}