feat: rework modules, items and fuel

docs/DATA-MODEL.md

@@ -390,19 +390,6 @@ Suggested station-side workforce fields:
 
 Commanders should not be ordinary cargo items even if they are population-derived.
 
-## Power State
-
-Ships and stations both need explicit operational power state.
-
-Suggested fields:
-
-- `fuelInventory`
-- `energyStored`
-- `powerOperational`
-- `powerDeficitReason?`
-
-This matters because no fuel leads to no power, and no power halts major operations.
-
 ## Inventories
 
 Inventories should remain generic item maps, but hosts should also have explicit context.