lighting: dynamic-only lights so no lighting build is required

The editor warned 'LIGHTING NEEDS TO BE REBUILT' (Build Lighting Only /
BuildLighting) because the sun and sky were Stationary with no baked lightmap.
The demo is a fixed daytime scene lit entirely dynamically, so:

- Config/DefaultEngine.ini: r.AllowStaticLighting=False - nothing to build.
- DemoMap + ReviewMap builders: sun, sky light, height fog and the staged
  mesh components are set to ComponentMobility.MOVABLE.

Also clears the Android File Server SecurityToken in DefaultEngine.ini: the
plugin is disabled and excluded from shipping, and the value is a credential
that must not be committed.

All 14 screenshots re-rendered; no lighting warnings in the build or run logs.

Tools/ue_build_demo_map.py

@@ -123,6 +123,12 @@ def build():
                     comp.set_editor_property(prop, value)
                 except Exception as exc:  # noqa: BLE001
                     log(f"sun.{prop} not set: {exc!r}")
+            # Movable: static lighting is disabled (r.AllowStaticLighting=False),
+            # so nothing needs a lighting build.
+            try:
+                comp.set_mobility(unreal.ComponentMobility.MOVABLE)
+            except Exception as exc:  # noqa: BLE001
+                log(f"sun mobility not set: {exc!r}")
         log("staged: Demo_Sun (pitch -50, yaw 120, intensity 4, warm)")
 
     sky = spawn(unreal.SkyLight, unreal.Vector(0, 0, 2000), "Demo_SkyLight")
@@ -134,6 +140,10 @@ def build():
                     comp.set_editor_property(prop, value)
                 except Exception as exc:  # noqa: BLE001
                     log(f"sky.{prop} not set: {exc!r}")
+            try:
+                comp.set_mobility(unreal.ComponentMobility.MOVABLE)
+            except Exception as exc:  # noqa: BLE001
+                log(f"sky mobility not set: {exc!r}")
         log("staged: Demo_SkyLight (intensity 2.6, real-time capture)")
 
     spawn(unreal.SkyAtmosphere, unreal.Vector(0, 0, 0), "Demo_Sky")
@@ -152,6 +162,10 @@ def build():
                     comp.set_editor_property(prop, value)
                 except Exception as exc:  # noqa: BLE001
                     log(f"fog.{prop} not set: {exc!r}")
+            try:
+                comp.set_mobility(unreal.ComponentMobility.MOVABLE)
+            except Exception as exc:  # noqa: BLE001
+                log(f"fog mobility not set: {exc!r}")
         log("staged: Demo_Fog (height fog, density 0.008)")
 
     # Fixed exposure: without this the same road renders washed out or black
@@ -185,7 +199,7 @@ def build():
         actor = spawn(unreal.StaticMeshActor, unreal.Vector(-10722.5, -1443.0, 0.0), "Hero_Facade")
         if actor:
             actor.static_mesh_component.set_static_mesh(hero)
-            actor.static_mesh_component.set_mobility(unreal.ComponentMobility.STATIC)
+            actor.static_mesh_component.set_mobility(unreal.ComponentMobility.MOVABLE)
             log("staged: Hero_Facade at the building line")
     else:
         log("MISSING: SM_HeroFacade — run Tools/ue_hero_facade_import.py")
@@ -212,7 +226,7 @@ def build():
         actor = spawn(unreal.StaticMeshActor, unreal.Vector(0, 0, 0), f"Demo_{name}")
         if actor:
             actor.static_mesh_component.set_static_mesh(mesh)
-            actor.static_mesh_component.set_mobility(unreal.ComponentMobility.STATIC)
+            actor.static_mesh_component.set_mobility(unreal.ComponentMobility.MOVABLE)
             mat = ensure_material(mat_name, rgb)
             if mat:
                 actor.static_mesh_component.set_material(0, mat)