feat(project): add workspace_id to issue/requirement with tri-state update

internal/project/requirement_service_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/stretchr/testify/require"
 
+	"github.com/yan1h/agent-coding-workflow/internal/audit"
 	"github.com/yan1h/agent-coding-workflow/internal/infra/errs"
 )
 
@@ -99,3 +100,78 @@ func TestRequirementService_Reopen_AllowsPhaseAgain(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, PhaseDone, out.Phase)
 }
+
+func TestRequirementService_Create_WithWorkspaceID(t *testing.T) {
+	repo := newFakeRepo()
+	owner := uuid.New()
+	seedProject(t, repo, owner)
+	svc, _, spy := newReqSvc(repo)
+	caller := Caller{UserID: owner}
+
+	wsID := uuid.New()
+	out, err := svc.Create(context.Background(), caller, "demo", CreateRequirementInput{
+		Title: "R", WorkspaceID: &wsID,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, out.WorkspaceID)
+	require.Equal(t, wsID, *out.WorkspaceID)
+
+	// 再 Get 一次确认持久化
+	got, err := svc.Get(context.Background(), caller, "demo", out.Number)
+	require.NoError(t, err)
+	require.NotNil(t, got.WorkspaceID)
+	require.Equal(t, wsID, *got.WorkspaceID)
+
+	// audit metadata 包含 workspace_id
+	require.NotEmpty(t, spy.entries)
+	var createEntry *audit.Entry
+	for i := range spy.entries {
+		if spy.entries[i].Action == "requirement.create" {
+			createEntry = &spy.entries[i]
+		}
+	}
+	require.NotNil(t, createEntry)
+	require.Equal(t, wsID.String(), createEntry.Metadata["workspace_id"])
+}
+
+func TestRequirementService_Update_WorkspaceID_TriState(t *testing.T) {
+	repo := newFakeRepo()
+	owner := uuid.New()
+	seedProject(t, repo, owner)
+	svc, _, _ := newReqSvc(repo)
+	caller := Caller{UserID: owner}
+
+	wsA := uuid.New()
+	r, err := svc.Create(context.Background(), caller, "demo", CreateRequirementInput{
+		Title: "R", WorkspaceID: &wsA,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, r.WorkspaceID)
+	require.Equal(t, wsA, *r.WorkspaceID)
+
+	// 1) nil → 不变（结合一个其它 patch 字段触发 update）
+	newTitle := "R2"
+	out, err := svc.Update(context.Background(), caller, "demo", r.Number, UpdateRequirementInput{
+		Title: &newTitle,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, out.WorkspaceID)
+	require.Equal(t, wsA, *out.WorkspaceID)
+
+	// 2) &id（非 Nil）→ 关联到新 workspace
+	wsB := uuid.New()
+	out, err = svc.Update(context.Background(), caller, "demo", r.Number, UpdateRequirementInput{
+		WorkspaceID: &wsB,
+	})
+	require.NoError(t, err)
+	require.NotNil(t, out.WorkspaceID)
+	require.Equal(t, wsB, *out.WorkspaceID)
+
+	// 3) &uuid.Nil → 显式解绑
+	nilUUID := uuid.Nil
+	out, err = svc.Update(context.Background(), caller, "demo", r.Number, UpdateRequirementInput{
+		WorkspaceID: &nilUUID,
+	})
+	require.NoError(t, err)
+	require.Nil(t, out.WorkspaceID)
+}