fix: LLM提醒触发加2次重试 — 避免ai-core繁忙时超时

backend/gateway/internal/handler/reminder_handler.go

@@ -382,21 +382,35 @@ func triggerLLMReminder(aiCoreURL, internalToken string, r store.Reminder) {
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("X-Internal-Token", internalToken)
 
+	// Retry up to 2 times (ai-core may be busy processing a message).
+	var lastErr error
+	for attempt := 0; attempt < 2; attempt++ {
+		if attempt > 0 {
+			time.Sleep(5 * time.Second)
+			// Re-create request body since previous one was consumed.
+			reqBody, _ = json.Marshal(body)
+			req, _ = http.NewRequest("POST", aiCoreURL+"/api/v1/internal/reminder-trigger", bytes.NewReader(reqBody))
+			req.Header.Set("Content-Type", "application/json")
+			req.Header.Set("X-Internal-Token", internalToken)
+		}
 		client := &http.Client{Timeout: 30 * time.Second}
 		resp, err := client.Do(req)
 		if err != nil {
-		logger.Printf("[ReminderScheduler] LLM提醒生成请求失败: %v", err)
-		return
+			lastErr = err
+			logger.Printf("[ReminderScheduler] LLM触发尝试%%d失败: %%v", attempt+1, err)
+			continue
 		}
-	defer resp.Body.Close()
-
 		if resp.StatusCode >= 400 {
 			bodyBytes, _ := io.ReadAll(resp.Body)
-		logger.Printf("[ReminderScheduler] LLM提醒生成返回 %d: %s", resp.StatusCode, string(bodyBytes))
+			resp.Body.Close()
+			logger.Printf("[ReminderScheduler] LLM触发返回 %%d: %%s", resp.StatusCode, string(bodyBytes))
 			return
 		}
-
-	logger.Printf("[ReminderScheduler] LLM提醒已触发: title=%s user=%s", r.Title, r.UserID)
+		resp.Body.Close()
+		logger.Printf("[ReminderScheduler] LLM提醒已触发: title=%%s user=%%s", r.Title, r.UserID)
+		return
+	}
+	logger.Printf("[ReminderScheduler] LLM触发最终失败: %%v", lastErr)
 }