chore: Add jump_url logging and plaintext fallback to approval messages to trace silent Discord drops

bot.py

@@ -740,14 +740,18 @@ class GravityBot(commands.Bot):
             embed.set_footer(text=f"ID: {request_id}")
 
             view = ApprovalView(request, buttons=buttons, hub=self.hub)
-            msg = await channel.send(embed=embed, view=view)
+            msg = await channel.send(
+                content=f"🔔 **새로운 승인 요청이 도착했습니다** (ID: {request_id[:8]})", 
+                embed=embed, 
+                view=view
+            )
 
             self._cap_dict(self._sent_approval_ids)
             self._sent_approval_ids[request_id] = True
             
             self._cap_dict(self._approval_messages)
             self._approval_messages[request_id] = msg.id
-            logger.info(f"[HUB-PENDING] Sent approval: {request_id[:12]} project={project}")
+            logger.info(f"[HUB-PENDING] Sent approval: {request_id[:12]} project={project} | URL: {msg.jump_url}")
 
         except Exception as e:
             logger.error(f"[HUB-PENDING] Error: {e}")