fix: wire retry into router, fix Docker config path, fix condition error handling, remove dead code

internal/engine/router.go

@@ -9,16 +9,10 @@ import (
 	"aiaa-notification-service/internal/adapter"
 	"aiaa-notification-service/internal/cache"
 	"aiaa-notification-service/internal/model"
+	"aiaa-notification-service/internal/retry"
 	"aiaa-notification-service/internal/store"
 )
 
-type SendResult struct {
-	ChannelType string `json:"channel_type"`
-	ChannelID   int    `json:"channel_id"`
-	Success     bool   `json:"success"`
-	Error       string `json:"error,omitempty"`
-}
-
 type Router struct {
 	store         *store.Store
 	cache         *cache.Cache
@@ -51,8 +45,11 @@ func (r *Router) Route(ctx context.Context, rule *model.Rule, title, content str
 			if ch.Config != nil {
 				cfg = *ch.Config
 			}
-			if err := s.Send(title, content, cfg); err != nil {
-				slog.Error("send failed", "channel_type", ch.Type, "channel_id", ch.ID, "error", err)
+			r := retry.DefaultRetrier()
+			if err := r.Do(context.Background(), func() error {
+				return s.Send(title, content, cfg)
+			}); err != nil {
+				slog.Error("send failed after retries", "channel_type", ch.Type, "channel_id", ch.ID, "error", err)
 			} else {
 				slog.Info("sent", "channel_type", ch.Type, "channel_id", ch.ID)
 			}