feat: parse attachments from embed URLs

cogs/aimod_cog.py

@@ -2127,9 +2127,10 @@ CRITICAL: Do NOT output anything other than the required JSON response.
         if message.author.bot:
             print(f"Ignoring message {message.id} from bot.")
             return
+        embed_urls = [embed.url for embed in message.embeds if embed.url]
         link_urls = (
-            self.extract_direct_attachment_urls(message.content)
-            if message.content
+            self.extract_direct_attachment_urls(" ".join(embed_urls))
+            if embed_urls
             else []
         )
         # Ignore messages without content, attachments, or direct attachment links