feat: 提醒到期 → LLM生成自然提醒语 → 推送

- Gateway ReminderScheduler 到期时调用 ai-core /api/v1/internal/reminder-trigger
- ai-core 用 LLM 生成温柔俏皮的提醒语，通过 messagePusher 推送
- Thinker 新增 TriggerReminderMessage 方法
- 环境变量: AI_CORE_URL (Gateway 已有)

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

backend/gateway/internal/handler/reminder_handler.go

@@ -1,8 +1,10 @@
 package handler
 
 import (
+	"bytes"
 	"encoding/json"
 	"html"
+	"io"
 	"git.yeij.top/AskaEth/Cyrene/pkg/logger"
 	"net/http"
 	"strconv"
@@ -242,7 +244,7 @@ func (h *ReminderHandler) Delete(c *gin.Context) {
 // ========== 提醒调度器 ==========
 
 // StartReminderScheduler 启动提醒调度器，每 30 秒检查一次到期提醒
-func StartReminderScheduler(s *store.ReminderStore, hub *ws.Hub) {
+func StartReminderScheduler(s *store.ReminderStore, hub *ws.Hub, aiCoreURL, internalToken string) {
 	go func() {
 		ticker := time.NewTicker(30 * time.Second)
 		defer ticker.Stop()
@@ -250,13 +252,13 @@ func StartReminderScheduler(s *store.ReminderStore, hub *ws.Hub) {
 		logger.Println("[ReminderScheduler] 提醒调度器已启动 (检查间隔: 30秒)")
 
 		for range ticker.C {
-			checkAndNotify(s, hub)
+			checkAndNotify(s, hub, aiCoreURL, internalToken)
 		}
 	}()
 }
 
-// checkAndNotify 检查到期提醒并推送通知
-func checkAndNotify(s *store.ReminderStore, hub *ws.Hub) {
+// checkAndNotify 检查到期提醒并推送通知 + 触发 LLM 生成自然提醒语
+func checkAndNotify(s *store.ReminderStore, hub *ws.Hub, aiCoreURL, internalToken string) {
 	reminders, err := s.GetDueReminders()
 	if err != nil {
 		logger.Printf("[ReminderScheduler] 获取到期提醒失败: %v", err)
@@ -297,7 +299,12 @@ func checkAndNotify(s *store.ReminderStore, hub *ws.Hub) {
 		// 2. 通过 Hub 向用户推送
 		hub.SendToUser(r.UserID, data)
 
-		// 3. 标记为已通知
+		// 3. 触发 LLM 生成自然提醒语
+		if aiCoreURL != "" && internalToken != "" {
+			go triggerLLMReminder(aiCoreURL, internalToken, r)
+		}
+
+		// 4. 标记为已通知
 		if err := s.MarkNotified(r.ID); err != nil {
 			logger.Printf("[ReminderScheduler] 标记已通知失败: id=%s err=%v", r.ID, err)
 		}
@@ -339,3 +346,38 @@ func calculateNextRemindAt(current time.Time, repeatType string) time.Time {
 		return current
 	}
 }
+
+func triggerLLMReminder(aiCoreURL, internalToken string, r store.Reminder) {
+	body := map[string]string{
+		"title":       r.Title,
+		"description": r.Description,
+		"user_id":     r.UserID,
+		"session_id":  r.SessionID,
+	}
+	reqBody, _ := json.Marshal(body)
+	req, err := http.NewRequest("POST", aiCoreURL+"/api/v1/internal/reminder-trigger", bytes.NewReader(reqBody))
+	if err != nil {
+		logger.Printf("[ReminderScheduler] 创建LLM请求失败: %v", err)
+		return
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("X-Internal-Token", internalToken)
+
+	client := &http.Client{Timeout: 15 * 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
+	}
+	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))
+		return
+	}
+
+	logger.Printf("[ReminderScheduler] LLM提醒已触发: title=%s user=%s", r.Title, r.UserID)
+}
+
+