fix: improve logging for wallet retry task and idempotent status updates

- Change misleading "unexpected" log to correctly indicate idempotent behavior
- Add debug log for completed records being skipped in retry task

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/identity-service/src/application/event-handlers/blockchain-wallet.handler.ts

@@ -161,7 +161,7 @@ export class BlockchainWalletHandler implements OnModuleInit {
         );
       } else {
         this.logger.log(
-          `[STATUS] Status not updated for user: ${userId} (unexpected - completed should always succeed)`,
+          `[STATUS] Status already 'completed' for user: ${userId} (idempotent - event redelivered)`,
         );
       }
 

backend/services/identity-service/src/application/tasks/wallet-retry.task.ts

@@ -120,6 +120,9 @@ export class WalletRetryTask {
 
     // 跳过已完成的
     if (currentStatus === 'completed') {
+      this.logger.debug(
+        `[TASK] User ${userId} status is 'completed', skipping`,
+      );
       return;
     }