feat(shops): let an offer sell a loot bag and carry bypass conditions

Adds a second, mutually exclusive target column (loot_bag_definition_id)
and a bypass_conditions column to shop_offers, so a later slice's quest
referral can open one offer that reputation alone would not. Keeps
shop.service.ts compiling against the now-nullable itemDefinition with
temporary non-null assertions; Task 4 replaces them with a real branch
on offer kind.

apps/api/src/shops/shop.service.ts

@@ -90,11 +90,16 @@ export class ShopService {
         offer.conditions,
       );
 
+      // TEMPORARY (Task 1 of Slice 0.8.5): `itemDefinition` became nullable
+      // when the offer table gained a loot-bag target alongside the item one.
+      // Every offer sold an item until Task 4 adds bag offers here, so the
+      // assertion is safe for now -- Task 4 replaces it with a real branch on
+      // offer kind.
       view.push({
-        itemKey: offer.itemDefinition.key,
-        itemName: offer.itemDefinition.name,
-        itemDescription: offer.itemDefinition.description,
-        iconPath: offer.itemDefinition.iconPath,
+        itemKey: offer.itemDefinition!.key,
+        itemName: offer.itemDefinition!.name,
+        itemDescription: offer.itemDefinition!.description,
+        iconPath: offer.itemDefinition!.iconPath,
         currencyType: offer.currencyType,
         price: offer.price,
         quantity: offer.quantity,
@@ -147,7 +152,7 @@ export class ShopService {
         relations: { itemDefinition: true },
       });
       const match = offers.find(
-        (candidate) => candidate.itemDefinition.key === itemKey,
+        (candidate) => candidate.itemDefinition!.key === itemKey,
       );
 
       if (!match) {
@@ -178,14 +183,14 @@ export class ShopService {
       await this.grantItem(
         manager,
         characterId,
-        match.itemDefinitionId,
+        match.itemDefinitionId!,
         match.quantity * quantity,
       );
 
       return {
         shopKey: shop.key,
         itemKey,
-        itemName: match.itemDefinition.name,
+        itemName: match.itemDefinition!.name,
         quantity: match.quantity * quantity,
         silverSpent,
         silverBalance: character.silver,