fix(tsconnect): restart map poll after SetExplicitServices

The previous implementation only triggered a lite map update (non-streaming,
OmitPeers=true), whose response is discarded. This meant notifyNetMap was
never called after setServices, so self.services was never visible to the
local node and peers received the update only on their next periodic poll.

Add RestartMap() to controlclient.Auto and call it from SetExplicitServices
after the lite update. This cancels the current streaming poll and starts a
fresh one, causing the control server to send back a full netmap that
includes the updated SelfNode.Hostinfo.Services.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ipn/ipnlocal/local.go

@@ -4980,9 +4980,16 @@ func (b *LocalBackend) SetExplicitServices(sl []tailcfg.Service) {
 	}
 	b.hostinfo.Services = sl
 	b.explicitServices = sl
+	ccAuto := b.ccAuto
 	b.mu.Unlock()
 
 	b.doSetHostinfoFilterServices()
+	// Restart the streaming map poll so the control server sends back a fresh
+	// netmap that includes our updated services in SelfNode, and so peers
+	// receive the update promptly via the control server's push.
+	if ccAuto != nil {
+		ccAuto.RestartMap()
+	}
 }
 
 // doSetHostinfoFilterServices calls SetHostinfo on the controlclient,