feat(api): add log webhook notification service

Implement webhook notifications for log error threshold alerts with
configurable thresholds, time windows, and cooldown periods.

- Add LogWebhookService with Redis-backed configuration storage
- Add admin endpoints for webhook config management (GET/PUT)
- Trigger webhook notifications when error count exceeds threshold
- Support status code threshold and error message detection
- Include sample log record data in webhook payload

internal/api/handler.go

@@ -17,14 +17,21 @@ import (
 )
 
 type Handler struct {
-	db     *gorm.DB
-	sync   *service.SyncService
-	logger *service.LogWriter
-	rdb    *redis.Client
+	db         *gorm.DB
+	sync       *service.SyncService
+	logger     *service.LogWriter
+	rdb        *redis.Client
+	logWebhook *service.LogWebhookService
 }
 
 func NewHandler(db *gorm.DB, sync *service.SyncService, logger *service.LogWriter, rdb *redis.Client) *Handler {
-	return &Handler{db: db, sync: sync, logger: logger, rdb: rdb}
+	return &Handler{
+		db:         db,
+		sync:       sync,
+		logger:     logger,
+		rdb:        rdb,
+		logWebhook: service.NewLogWebhookService(rdb),
+	}
 }
 
 // CreateKey is now handled by MasterHandler
@@ -471,7 +478,13 @@ func (h *Handler) IngestLog(c *gin.Context) {
 	}
 
 	// By default, only metadata is expected; payload fields may be empty.
-	h.logger.Write(rec)
+	if h.logger != nil {
+		h.logger.Write(rec)
+	}
+	if h.logWebhook != nil {
+		recCopy := rec
+		go h.logWebhook.NotifyIfNeeded(context.Background(), recCopy)
+	}
 	c.JSON(http.StatusAccepted, gin.H{"status": "queued"})
 }