fix: start system default sync channels by default

Create and restart paths enable IsSystemDefault channels; SyncPage auto-starts after save.

Co-authored-by: Cursor <cursoragent@cursor.com>

platform/internal/dbsync/ensure_default_channel.go

@@ -73,7 +73,7 @@ func (s *FileStore) EnsureSystemDefaultChannel(opts DefaultChannelOpts) (Channel
 	ch := Channel{
 		TenantID:        opts.TenantID,
 		Name:            name,
-		Enabled:         false, // 默认同步通道供 agent push 落点；不启本地 outbox 轮询
+		Enabled:         true, // 默认运行中：可收 agent push，并预热 remote
 		Direction:       DirLocalToRemote,
 		ConflictPolicy:  PolicyLWWSource,
 		IsSystemDefault: true,
@@ -107,3 +107,22 @@ func ResolveOnlineDBID(explicit, channelID string) string {
 	}
 	return strings.TrimSpace(channelID)
 }
+
+// EnsureAndStartSystemDefaultChannel 创建/复用公司默认同步通道，并确保处于运行中（Enabled + runner）。
+func (m *Manager) EnsureAndStartSystemDefaultChannel(opts DefaultChannelOpts) (Channel, error) {
+	if m == nil || m.store == nil {
+		return Channel{}, fmt.Errorf("dbsync not enabled")
+	}
+	ch, err := m.store.EnsureSystemDefaultChannel(opts)
+	if err != nil {
+		return Channel{}, err
+	}
+	if err := m.StartChannel(ch.ID); err != nil {
+		return ch, fmt.Errorf("start default channel: %w", err)
+	}
+	if updated, err := m.store.GetChannel(ch.ID); err == nil {
+		return *updated, nil
+	}
+	ch.Enabled = true
+	return ch, nil
+}

platform/internal/dbsync/manager.go

@@ -28,7 +28,8 @@ func (m *Manager) StartAll(ctx context.Context) {
 		return
 	}
 	for _, ch := range list {
-		if ch.Enabled {
+		// 公司默认同步通道默认运行中（即使历史记录曾为 Enabled=false）
+		if ch.Enabled || ch.IsSystemDefault {
 			_ = m.StartChannel(ch.ID)
 		}
 	}