fix(media): failed to store the media to /data/media and add image part

internal/pipeline/rendering.go

@@ -14,6 +14,13 @@ type RenderedContentPiece struct {
 	URL  string `json:"url,omitempty"`
 }
 
+// ImageAttachmentRef holds the content hash and MIME type of an image
+// attachment that can be inlined as a vision input via the media store.
+type ImageAttachmentRef struct {
+	ContentHash string `json:"content_hash"`
+	Mime        string `json:"mime,omitempty"`
+}
+
 // RenderedSegment is a single segment of rendered context, one per IC node.
 type RenderedSegment struct {
 	ReceivedAtMs int64                  `json:"received_at_ms"`
@@ -22,6 +29,7 @@ type RenderedSegment struct {
 	IsSelfSent   bool                   `json:"is_self_sent,omitempty"`
 	MentionsMe   bool                   `json:"mentions_me,omitempty"`
 	RepliesToMe  bool                   `json:"replies_to_me,omitempty"`
+	ImageRefs    []ImageAttachmentRef   `json:"image_refs,omitempty"`
 }
 
 // RenderedContext is the output of the Rendering layer — a slice of segments.
@@ -140,6 +148,16 @@ func renderMessage(msg *ICMessage, params RenderParams) RenderedSegment {
 
 	pieces := []RenderedContentPiece{{Type: "text", Text: text}}
 
+	var imageRefs []ImageAttachmentRef
+	for _, att := range msg.Attachments {
+		if strings.EqualFold(att.Type, "image") && att.ContentHash != "" {
+			imageRefs = append(imageRefs, ImageAttachmentRef{
+				ContentHash: att.ContentHash,
+				Mime:        att.MimeType,
+			})
+		}
+	}
+
 	return RenderedSegment{
 		ReceivedAtMs: msg.ReceivedAtMs,
 		Content:      pieces,
@@ -147,6 +165,7 @@ func renderMessage(msg *ICMessage, params RenderParams) RenderedSegment {
 		IsSelfSent:   msg.IsSelfSent,
 		MentionsMe:   mentionsMe,
 		RepliesToMe:  repliesToMe,
+		ImageRefs:    imageRefs,
 	}
 }