Merge main into ui-refactor; port MDM support to the Wails UI

Integrates main's MDM configuration-profile feature and adapts it to the
Wails UI (this branch had already replaced the Fyne UI).

Conflict resolution:
- go.mod/go.sum: take main's deps; howett.net/plist pinned to v1.0.2-... (tidy)
- client/proto/daemon.pb.go: regenerated from the merged daemon.proto
- client/internal/peer/status.go: union of ipToKey (main) + sessionExpiresAt (HEAD)
- client/server/server.go: main's intent/liveness model (connectionGoroutineRunning,
  clientRunning no longer cleared by the goroutine) + empty-PSK guard
- client/ui/client_ui.go, client/ui/profile.go: removed (dead Fyne UI)

MDM port (backend + tray):
- services/settings.go: expose MDMManagedFields plus a managedFields map keyed
  by Config field names so the settings form can gate a control without
  translating mdm.Key* names
- tray: gate Profiles / Exit Node menus on DisableProfiles / DisableNetworks via
  GetFeatures, refreshed on the config_changed system event (replaces the legacy
  2s poll); localized MDM policy-applied toast in all shipped locales
- client/proto/metadata.go: shared constants for the config_changed /
  policy_applied event markers

PreSharedKey: GetConfig now returns preSharedKeySet (bool) instead of the masked
value; the settings form provides its own placeholder and sends a new key only
when the user types one.

client/embed/embed.go

@@ -446,8 +446,8 @@ func (c *Client) Expose(ctx context.Context, req ExposeRequest) (*ExposeSession,
 
 // IdentityForIP looks up a remote peer by its tunnel IP using the
 // embedded client's status recorder. Returns the peer's WireGuard public
-// key and FQDN. ok=false means the IP isn't in this client's peer
-// roster — callers should treat that as "unknown peer".
+// key and FQDN. ok=false means the IP doesn't belong to an active peer
+// — offline roster peers are treated as unknown, same as foreign IPs.
 func (c *Client) IdentityForIP(ip netip.Addr) (pubKey, fqdn string, ok bool) {
 	if !ip.IsValid() || c.recorder == nil {
 		return "", "", false