feat: enhance Safew watcher initialization and token management

- Added functionality to list and start Safew tokens in the main server function, ensuring proper initialization of the Safew watcher.
- Introduced `ensureSafewWatcher` method in the ChannelHandler to manage Safew tokens during channel creation and updates.
- Implemented `StartTokens` method in the Watcher to handle multiple tokens efficiently.
- Enhanced error handling and logging for Safew watcher operations to improve observability.

internal/safew/watcher.go

@@ -67,6 +67,12 @@ func (w *Watcher) Ensure(token string) {
 	w.ensure(token)
 }
 
+func (w *Watcher) StartTokens(tokens []string) {
+	for _, token := range tokens {
+		w.Ensure(strings.TrimSpace(token))
+	}
+}
+
 func (w *Watcher) ensure(token string) *runner {
 	if token == "" || w == nil {
 		return nil
@@ -82,6 +88,7 @@ func (w *Watcher) ensure(token string) *runner {
 	ctx, cancel := context.WithCancel(context.Background())
 	r := &runner{cancel: cancel, firstDone: make(chan struct{})}
 	w.running[token] = r
+	slog.Info("safew watcher started")
 	go w.loop(ctx, token, r)
 	return r
 }
@@ -144,7 +151,7 @@ func (w *Watcher) loop(ctx context.Context, token string, r *runner) {
 				return
 			}
 			if isGetUpdatesConflict(err) {
-				slog.Debug("safew watcher poll conflict", "error", err)
+				slog.Info("safew watcher poll conflict", "error", err)
 				if !w.sleep(ctx, conflictBackoff(w.bgIdle)) {
 					return
 				}
@@ -176,6 +183,7 @@ func (w *Watcher) pollOnce(ctx context.Context, token string, timeout int) error
 		return err
 	}
 	if !ok {
+		slog.Info("safew poll skipped", "reason", "lock held", "timeout", timeout)
 		return nil
 	}
 	defer func() { _ = w.store.UnlockSafewPoll(ctx, token) }()
@@ -188,6 +196,7 @@ func (w *Watcher) pollOnce(ctx context.Context, token string, timeout int) error
 	if err != nil {
 		return err
 	}
+	slog.Info("safew poll", "timeout", timeout, "groups", len(chats), "offset", next)
 	if err := w.mergeAndLog(ctx, token, chats); err != nil {
 		return err
 	}