Type vlayer forward declarations and config entries

The gui element locals are declared at the top and assigned far below,
so emmylua inferred them as nil at every use site.

circuit_oc was reassigned from a control behaviour to a logistic
section, which hid every section method behind the wrong type.

allowed_items entries carry heterogeneous optional properties, now
described by a class.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_legacy/module/modules/gui/vlayer.lua

@@ -22,9 +22,9 @@ local function aabb_align_expand(aabb)
     }
 end
 
-local vlayer_container
-local vlayer_gui_control_type
-local vlayer_gui_control_list
+local vlayer_container --- @type ExpElement
+local vlayer_gui_control_type --- @type ExpElement
+local vlayer_gui_control_list --- @type ExpElement
 
 local vlayer_control_type_list = {
     [1] = "energy",
@@ -87,7 +87,7 @@ SelectArea:on_selection(function(event)
     local container = Gui.get_left_element(vlayer_container, player)
     local disp = container.frame["vlayer_st_2"].disp.table
     local target = vlayer_control_type_list[disp[vlayer_gui_control_type.name].selected_index]
-    local entities
+    local entities --- @type LuaEntity[]
 
     if config.power_on_space and event.surface and event.surface.platform and target == "energy" then
         if player.force.technologies[config.power_on_space_research.name].level >= config.power_on_space_research.level then