fix(backend): harden write registrar boundaries

backend/internal/logic/tasks/handlers_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
+	"strings"
 	"testing"
 
 	"github.com/gin-gonic/gin"
@@ -52,7 +53,7 @@ func TestTaskRegistrarMovesTaskByIdentityAndClearsForeignProjectTag(t *testing.T
 	note := models.SenlinAgentNote{ProjectID: first.ID, CreatedBy: 1, Title: "旧项目资料", Markdown: "仅可在 Alpha 分享"}
 	require.NoError(t, database.Create(&note).Error)
 	require.NoError(t, NewService(database).ShareObject(task.ID, "note", note.ID))
-	body := bytes.NewBufferString(fmt.Sprintf(`{"title":"迁移任务","description":"已移动","completed":false,"nextProjectId":%q}`, second.Identity))
+	body := bytes.NewBufferString(fmt.Sprintf(`{"title":"迁移任务","description":"已移动","completed":false,"nextProjectId":%q}`, strings.ToUpper(second.Identity)))
 	req := httptest.NewRequest(http.MethodPatch, "/api/v1/projects/"+first.Identity+"/tasks/"+task.Identity, body)
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("Authorization", "Bearer test-token")