feat(t206): connect Android procurement tasks

backend-api/internal/transport/httpapi/device_handlers.go

@@ -5,6 +5,7 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"cmroubao/backend-api/internal/domain"
 	"cmroubao/backend-api/internal/transport/authcommon"
@@ -235,8 +236,11 @@ func (handler *deviceHandlers) startTask(ctx *gin.Context) {
 	}
 	ctx.Header("Cache-Control", "no-store")
 	ctx.JSON(http.StatusOK, gin.H{
-		"task":        deviceTaskResponse(result.Task),
-		"execution":   executionResponse(result.Execution),
+		"task": deviceTaskResponse(result.Task),
+		"execution": deviceExecutionResponse(
+			result.Execution,
+			result.Task.ClaimExpiresAt,
+		),
 		"replayed":    result.Replayed,
 		"server_time": formatTime(result.ServerTime),
 	})
@@ -275,8 +279,11 @@ func (handler *deviceHandlers) heartbeatTask(ctx *gin.Context) {
 	}
 	ctx.Header("Cache-Control", "no-store")
 	ctx.JSON(http.StatusOK, gin.H{
-		"task":             deviceTaskResponse(result.Task),
-		"execution":        executionResponse(result.Execution),
+		"task": deviceTaskResponse(result.Task),
+		"execution": deviceExecutionResponse(
+			result.Execution,
+			result.Task.ClaimExpiresAt,
+		),
 		"cancel_requested": result.CancelRequested,
 		"server_time":      formatTime(result.ServerTime),
 	})
@@ -453,3 +460,12 @@ func deviceTaskResponse(task domain.PurchaseTask) gin.H {
 		"currency":            task.Currency,
 	}
 }
+
+func deviceExecutionResponse(
+	execution domain.TaskExecution,
+	expiresAt *time.Time,
+) gin.H {
+	response := executionResponse(execution)
+	response["execution_expires_at"] = formatOptionalTime(expiresAt)
+	return response
+}