fix(channels): declare managed media cleanup policy

Explicitly mark downloaded and managed channel media as delete-on-cleanup so media ownership is visible at each registration site.

Refs #1886

pkg/channels/discord/discord.go

@@ -396,8 +396,9 @@ func (c *DiscordChannel) handleMessage(s *discordgo.Session, m *discordgo.Messag
 	storeMedia := func(localPath, filename string) string {
 		if store := c.GetMediaStore(); store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename: filename,
+				Filename:      filename,
-				Source:   "discord",
+				Source:        "discord",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/feishu/feishu_64.go

@@ -725,8 +725,9 @@ func (c *FeishuChannel) downloadResource(
 	out.Close()
 
 	ref, err := store.Store(localPath, media.MediaMeta{
-		Filename: filename,
+		Filename:      filename,
-		Source:   "feishu",
+		Source:        "feishu",
+		CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 	}, scope)
 	if err != nil {
 		logger.ErrorCF("feishu", "Failed to store downloaded resource", map[string]any{

pkg/channels/line/line.go

@@ -301,8 +301,9 @@ func (c *LINEChannel) processEvent(event lineEvent) {
 	storeMedia := func(localPath, filename string) string {
 		if store := c.GetMediaStore(); store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename: filename,
+				Filename:      filename,
-				Source:   "line",
+				Source:        "line",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/matrix/matrix.go

@@ -692,6 +692,9 @@ func (c *MatrixChannel) extractInboundMedia(
 
 func (c *MatrixChannel) storeMedia(localPath string, meta media.MediaMeta, scope string) string {
 	if store := c.GetMediaStore(); store != nil {
+		if meta.CleanupPolicy == "" {
+			meta.CleanupPolicy = media.CleanupPolicyDeleteOnCleanup
+		}
 		ref, err := store.Store(localPath, meta, scope)
 		if err == nil {
 			return ref

pkg/channels/onebot/onebot.go

@@ -749,8 +749,9 @@ func (c *OneBotChannel) parseMessageSegments(
 	storeFile := func(localPath, filename string) string {
 		if store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename: filename,
+				Filename:      filename,
-				Source:   "onebot",
+				Source:        "onebot",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/qq/qq.go

@@ -670,9 +670,10 @@ func (c *QQChannel) extractInboundAttachments(
 	storeMedia := func(localPath string, attachment *dto.MessageAttachment) string {
 		if store := c.GetMediaStore(); store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename:    qqAttachmentFilename(attachment),
+				Filename:      qqAttachmentFilename(attachment),
-				ContentType: attachment.ContentType,
+				ContentType:   attachment.ContentType,
-				Source:      "qq",
+				Source:        "qq",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/slack/slack.go

@@ -327,8 +327,9 @@ func (c *SlackChannel) handleMessageEvent(ev *slackevents.MessageEvent) {
 	storeMedia := func(localPath, filename string) string {
 		if store := c.GetMediaStore(); store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename: filename,
+				Filename:      filename,
-				Source:   "slack",
+				Source:        "slack",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/telegram/telegram.go

@@ -561,8 +561,9 @@ func (c *TelegramChannel) handleMessage(ctx context.Context, message *telego.Mes
 	storeMedia := func(localPath, filename string) string {
 		if store := c.GetMediaStore(); store != nil {
 			ref, err := store.Store(localPath, media.MediaMeta{
-				Filename: filename,
+				Filename:      filename,
-				Source:   "telegram",
+				Source:        "telegram",
+				CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 			}, scope)
 			if err == nil {
 				return ref

pkg/channels/wecom/aibot_ws.go

@@ -1218,8 +1218,9 @@ func (c *WeComAIBotWSChannel) storeWSMedia(
 
 	scope := channels.BuildMediaScope("wecom_aibot", chatID, msgID)
 	ref, err := store.Store(tmpPath, media.MediaMeta{
-		Filename: msgID + ext,
+		Filename:      msgID + ext,
-		Source:   "wecom_aibot",
+		Source:        "wecom_aibot",
+		CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 	}, scope)
 	if err != nil {
 		os.Remove(tmpPath)

pkg/channels/weixin/media.go

@@ -291,9 +291,10 @@ func (c *WeixinChannel) storeInboundBytes(
 		return "", err
 	}
 	ref, err := store.Store(tmpPath, media.MediaMeta{
-		Filename:    filename,
+		Filename:      filename,
-		ContentType: contentType,
+		ContentType:   contentType,
-		Source:      "weixin",
+		Source:        "weixin",
+		CleanupPolicy: media.CleanupPolicyDeleteOnCleanup,
 	}, basechannels.BuildMediaScope("weixin", chatID, messageID))
 	if err != nil {
 		os.Remove(tmpPath)