fix: 승인 메시지 중복 전송 수정 - in-memory sent tracking

bot.py

@@ -126,6 +126,7 @@ class GravityBot(commands.Bot):
         self.session_status_messages: dict[str, int] = {}
         self.session_names: dict[str, str] = {}
         self._channel_create_lock = asyncio.Lock()  # SINGLE global lock
+        self._sent_approval_ids: set[str] = set()  # Track sent approvals
         self.bridge = BridgeProtocol()
         self.session_category: discord.CategoryChannel | None = None
         self.guild: discord.Guild | None = None
@@ -347,8 +348,10 @@ class GravityBot(commands.Bot):
         try:
             requests = self.bridge.get_pending_requests()
             for req in requests:
-                if req.discord_message_id != 0:
+                if req.request_id in self._sent_approval_ids:
                     continue  # Already sent
+                if req.discord_message_id != 0:
+                    continue
 
                 channel = self.session_channels.get(req.conversation_id)
                 if not channel:
@@ -360,6 +363,7 @@ class GravityBot(commands.Bot):
                         )
 
                 if channel:
+                    self._sent_approval_ids.add(req.request_id)
                     await self._send_approval_request(channel, req)
         except Exception as e:
             logger.error(f"Error scanning approvals: {e}")