Generate stations that respect empty hardpoints and required items

UnoccupiedSpace now counts empty hardpoint cells as free, matching
ItemFits: general gear may use a hardpoint until hardpoint gear claims
it. LoadoutGenerator equips hardpoint gear before the docking bay, so the
bay cannot take the reactor's slot. Hulls, docking bays, controllers,
cargo bays and capacitors are required: if no manufacturer present in the
galaxy and known to the faction makes one, any manufacturer is used and
the database gap is logged, so a galaxy without AU still gets stations.
Manufacturer preference is allegiance / (1 + hops to headquarters); the
distance term previously never applied due to operator precedence, and
would have divided by zero in the headquarters zone.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Assets/Scripts/ServerShared/Entity.cs

@@ -420,7 +420,8 @@ public abstract class Entity
             var emptyShape = new Shape(HullData.Shape.Width, HullData.Shape.Height);
             foreach (var v in HullData.Shape.Coordinates)
             {
-                if (HullData.InteriorCells[v] && GearOccupancy[v.x, v.y] == null && Hardpoints[v.x,v.y] == null)
+                // Empty hardpoint cells count as free: general gear may use them until hardpoint gear claims them
+                if (HullData.InteriorCells[v] && GearOccupancy[v.x, v.y] == null)
                     emptyShape[v] = true;
             }