feat(inventory): enforce DeletionRestrictions when deleting items

Deleting an item now follows its ItemComponent delResIndex row in the
DeletionRestrictions table, the way the client's shared inventory code
decides it (LWOInventoryComponent_Common::CanRemoveFromInventory @
0x00ce0d20, CheckDeletionRestrictionIndex @ 0x00c94c20):
- missing, unrestricted, unknown-type or empty rows allow it;
- LOTS_INCLUDED: another item of any listed LOT must remain;
- LOTS_EXCLUDED: other items of every listed LOT must remain;
- ANY_RESTRICTION / ALL_RESTRICTIONS: any / all listed rows allow it;
- ZONE: only in the listed maps; ALWAYS_RESTRICTED: never.
Operators (GM level 9) may delete anything, as in the client. A refused
delete is logged and the item stays.

ItemComponent.minNumRequired is not used: the client never reads it, so
its meaning can't be verified.

Issue 960: the rocket (6416, row 8) and the classic rocket parts (rows 1-3)
have rows that keep at least one rocket or part, so the last rocket can
no longer be deleted and strand the player.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dGame/dComponents/InventoryComponent.h

@@ -4,6 +4,7 @@
 #define INVENTORYCOMPONENT_H
 
 #include <map>
+#include <set>
 #include <stack>
 
 
@@ -333,6 +334,12 @@ public:
 	 */
 	std::vector<uint32_t> FindBuffs(Item* item, bool castOnEquip) const;
 
+	/**
+	 * One DeletionRestrictions row (CheckDeletionRestrictionIndex @ 00c94c20). visited stops rows that refer back to
+	 * themselves; the client lets such rows through.
+	 */
+	bool CheckDeletionRestriction(LWOOBJID itemId, int32_t row, std::set<int32_t>& visited) const;
+
 	/**
 	 * Initializes the equipped items with a list of items
 	 * @param items the items to equip
@@ -451,6 +458,12 @@ public:
 	void OnEquipInventory(const GameMessages::EquipInventory& msg);
 	void OnUnEquipInventory(const GameMessages::UnEquipInventory& msg);
 	void OnRemoveItemFromInventory(const GameMessages::RemoveItemFromInventory& msg);
+
+	/**
+	 * Whether the player may delete this item: its ItemComponent's DeletionRestrictions row, as the client checks it
+	 * (LWOInventoryComponent_Common::CanRemoveFromInventory @ 00ce0d20 in 1.10.64). Operators may delete anything.
+	 */
+	bool CanDelete(const Item& item) const;
 	void OnMoveItemInInventory(const GameMessages::MoveItemInInventory& msg);
 	void OnMoveItemBetweenInventoryTypes(const GameMessages::MoveItemBetweenInventoryTypes& msg);
 	// Answers the client at sysAddr with ResponseMoveItemBetweenInventoryTypes.