feat: show media attachment notice for unsupported post types (photos/videos)

crates/adapters/activitypub-base/src/service.rs

@@ -1587,9 +1587,27 @@ impl domain::ports::FederationActionPort for ActivityPubService {
                     .ok()?
                     .with_timezone(&chrono::Utc);
 
+                let text = note["content"].as_str().unwrap_or("").to_string();
+                let has_attachments = note["attachment"]
+                    .as_array()
+                    .map(|a| !a.is_empty())
+                    .unwrap_or(false);
+
+                let content = if has_attachments {
+                    let notice =
+                        "<p class=\"media-notice\">📎 Media attachment — not supported</p>";
+                    if text.is_empty() {
+                        notice.to_string()
+                    } else {
+                        format!("{text}{notice}")
+                    }
+                } else {
+                    text
+                };
+
                 Some(domain::models::remote_note::RemoteNote {
                     ap_id: note["id"].as_str()?.to_string(),
-                    content: note["content"].as_str().unwrap_or("").to_string(),
+                    content,
                     published,
                     sensitive: note["sensitive"].as_bool().unwrap_or(false),
                     content_warning: note["summary"].as_str().map(|s| s.to_string()),