fix: clarify seedance reference video failures

handler/ai.go

@@ -263,6 +263,9 @@ func aiUpstreamErrorDetail(body []byte) string {
 	}
 	if err := json.Unmarshal(body, &payload); err == nil {
 		if payload.Error.Message != "" {
+			if detail := friendlyUpstreamError(payload.Error.Code, payload.Error.Message); detail != "" {
+				return safeUpstreamText(detail)
+			}
 			if payload.Error.Code != "" {
 				return safeUpstreamText(payload.Error.Code + " " + payload.Error.Message)
 			}
@@ -278,6 +281,14 @@ func aiUpstreamErrorDetail(body []byte) string {
 	return safeUpstreamText(text)
 }
 
+func friendlyUpstreamError(code string, message string) string {
+	lowerCode := strings.ToLower(strings.TrimSpace(code))
+	if strings.Contains(lowerCode, "inputvideosensitivecontentdetected") || strings.Contains(lowerCode, "privacyinformation") {
+		return strings.TrimSpace(code + " 参考视频疑似包含真人或隐私信息，火山方舟拒绝使用普通 URL 作为真人视频参考；请改用不含真人的视频、官方允许的模型产物，或已授权的 asset:// 素材。原始错误：" + message)
+	}
+	return ""
+}
+
 func safeUpstreamText(text string) string {
 	text = strings.Join(strings.Fields(strings.TrimSpace(text)), " ")
 	runes := []rune(text)

handler/ai_test.go

@@ -12,6 +12,13 @@ func TestAIUpstreamErrorDetail(t *testing.T) {
 	}
 }
 
+func TestAIUpstreamErrorDetailExplainsSensitiveVideo(t *testing.T) {
+	got := aiUpstreamErrorDetail([]byte(`{"error":{"code":"InputVideoSensitiveContentDetected.PrivacyInformation","message":"The request failed because the input video may contain real person."}}`))
+	if !strings.Contains(got, "参考视频疑似包含真人") || !strings.Contains(got, "asset://") {
+		t.Fatalf("detail = %q", got)
+	}
+}
+
 func TestSafeUpstreamTextTruncates(t *testing.T) {
 	got := safeUpstreamText(strings.Repeat("错", 320))
 	if len([]rune(got)) != 303 {

handler/media_reference.go

@@ -117,7 +117,25 @@ func ReferenceMedia(w http.ResponseWriter, r *http.Request, id string) {
 }
 
 func referenceMediaDir() string {
-	return filepath.Join("data", "reference-media")
+	return filepath.Join(referenceDataDir(), "reference-media")
+}
+
+func referenceDataDir() string {
+	driver := strings.ToLower(strings.TrimSpace(config.Cfg.StorageDriver))
+	dsn := strings.TrimSpace(config.Cfg.DatabaseDSN)
+	if (driver == "" || driver == "sqlite") && dsn != "" && dsn != ":memory:" && !strings.HasPrefix(dsn, "file:") {
+		pathPart := dsn
+		if index := strings.Index(dsn, "?"); index >= 0 {
+			pathPart = dsn[:index]
+		}
+		if filepath.IsAbs(pathPart) {
+			return filepath.Dir(pathPart)
+		}
+	}
+	if _, err := os.Stat("/app/data"); err == nil {
+		return "/app/data"
+	}
+	return "data"
 }
 
 func normalizeReferenceMediaType(contentType string, ext string) (string, string, bool) {

handler/media_reference_test.go

@@ -1,6 +1,11 @@
 package handler
 
-import "testing"
+import (
+	"path/filepath"
+	"testing"
+
+	"github.com/basketikun/infinite-canvas/config"
+)
 
 func TestNormalizeReferenceMediaTypeSupportsAudio(t *testing.T) {
 	tests := []struct {
@@ -38,3 +43,14 @@ func TestReferenceMediaTypeMaxBytes(t *testing.T) {
 		t.Fatalf("image max bytes = %d, want %d", got, referenceImageMaxBytes)
 	}
 }
+
+func TestReferenceMediaDirUsesAbsoluteSQLiteDataDir(t *testing.T) {
+	previous := config.Cfg
+	t.Cleanup(func() { config.Cfg = previous })
+	root := t.TempDir()
+	config.Cfg = config.Config{StorageDriver: "sqlite", DatabaseDSN: filepath.Join(root, "infinite-canvas.db")}
+
+	if got := referenceMediaDir(); got != filepath.Join(root, "reference-media") {
+		t.Fatalf("referenceMediaDir = %q", got)
+	}
+}