Inventory Slot Upgrade

Adds a normal shop upgrade box to R.E.P.O. Buying and activating it in the truck grants that player one additional inventory slot.

Current behavior

• Displayed shop price: 100,000 by default, configurable from 100,000 to 1,000,000 in exact 10,000 increments through the Inventory Slot Upgrade entry in REPOConfig or the BepInEx config file.
• One box can appear in a shop by default.
• Each activation adds one slot, up to 10 total slots.
• Purchases stop after enough boxes have been bought to reach the configured slot maximum.
• Extra slots use keys 4, 5, 6, 7, 8, 9, and 0.
• Upgrade levels are saved and synchronized through REPOLib.
• Items in extra slots are restored across level changes like the three vanilla slots.
• The upgrade box uses its own embedded 4+ inventory-slot decal.
• Every player must install the mod and REPOLib for multiplayer.

Development

1. Copy Directory.Repo.props.example to Directory.Repo.props and fill in the local paths.
2. Run dotnet build -c Release.
3. The local package is written to dist/InventorySlotUpgrade/.

Do not run this together with MoreInventorySlots or BagExpander; those mods patch the same inventory UI and slot limits.