Admin: install parts, set time and weather; join without prompt

- VEHICLE: INSTALL for parts that are not installed - runs the game's own
  assembly (trigger "Assembly" like on load), so the part sits exactly on its
  pivot; synced to other players via FsmSync (MSCO_INSTALL)
- WORLD: time buttons (2-hour steps via the sun FSM's load path) and
  CLEAR / RAIN / THUNDERSTORM (weather front moved above the admin);
  sent to everyone as mod message "msco.world" (no server update needed)
- JOIN from the server browser/website connects right away in the main menu;
  server mods still ask before downloading

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

FsmSync.cs

@@ -292,6 +292,7 @@ namespace MSCO
                 if (Debug) MscoLog.Warning("[MSCO] << not found: " + msg.Path + " [" + msg.FsmName + "]");
                 return;
             }
+            if (msg.EventName == VehicleAdmin.InstallEvent) { VehicleAdmin.InstallRemote(fsm); return; } // Admin hat ein Teil eingebaut
             FsmState state = fsm.Fsm.GetState(msg.State);
             if (state == null || switchState == null) return;