feat(smoke): support reason tags on smoke logs

internal/smoke/service/smoke_log_service_test.go

@@ -29,6 +29,7 @@ CREATE TABLE fa_smoke_log (
   smoke_time DATE NULL,
   smoke_at DATETIME NULL,
   remark TEXT,
+  reason_tags TEXT,
   createtime INTEGER,
   updatetime INTEGER,
   deletetime INTEGER,
@@ -68,3 +69,60 @@ func TestSmokeLogServiceCreateKeepsZeroForResisted(t *testing.T) {
 	}
 }
 
+func TestSmokeLogServiceCreatePersistsReasonTags(t *testing.T) {
+	t.Parallel()
+
+	db := setupSmokeLogServiceTestDB(t)
+	svc := NewSmokeLogService(db)
+
+	smokeAt := time.Date(2026, 3, 4, 8, 30, 0, 0, time.Local)
+	_, err := svc.Create(context.Background(), 1002, CreateSmokeLogRequest{
+		SmokeAt:    &smokeAt,
+		Remark:     "压力大；会后补了一根",
+		ReasonTags: smokemodel.StringSlice{"stress", "social"},
+		Level:      3,
+		Num:        1,
+	})
+	if err != nil {
+		t.Fatalf("create log with reason tags: %v", err)
+	}
+
+	var got smokemodel.SmokeLog
+	if err := db.Where("uid = ?", 1002).Order("id DESC").First(&got).Error; err != nil {
+		t.Fatalf("load created record: %v", err)
+	}
+
+	if len(got.ReasonTags) != 2 || got.ReasonTags[0] != "stress" || got.ReasonTags[1] != "social" {
+		t.Fatalf("created reason_tags=%v, want=[stress social]", got.ReasonTags)
+	}
+}
+
+func TestSmokeLogServiceUpdatePersistsReasonTags(t *testing.T) {
+	t.Parallel()
+
+	db := setupSmokeLogServiceTestDB(t)
+	svc := NewSmokeLogService(db)
+
+	smokeAt := time.Date(2026, 3, 4, 9, 0, 0, 0, time.Local)
+	record, err := svc.Create(context.Background(), 1003, CreateSmokeLogRequest{
+		SmokeAt: &smokeAt,
+		Remark:  "old",
+		Level:   2,
+		Num:     1,
+	})
+	if err != nil {
+		t.Fatalf("create seed log: %v", err)
+	}
+
+	reasonTags := smokemodel.StringSlice{"after_meal", "other"}
+	updated, err := svc.Update(context.Background(), 1003, record.ID, UpdateSmokeLogRequest{
+		ReasonTags: &reasonTags,
+	})
+	if err != nil {
+		t.Fatalf("update reason_tags: %v", err)
+	}
+
+	if len(updated.ReasonTags) != 2 || updated.ReasonTags[0] != "after_meal" || updated.ReasonTags[1] != "other" {
+		t.Fatalf("updated reason_tags=%v, want=[after_meal other]", updated.ReasonTags)
+	}
+}