Slug-based scenarios, quests and offers per the environments contract; regenerated models; e2e seed passes environment to admin mirrors

Claude-Session: https://claude.ai/code/session_01SMCvdwDmuxoaqGgvGBLk1V

src/generated/api.ts

@@ -163,10 +163,10 @@ export const api = {
 
   purchaseOffer: (
     t: Transport,
-    path: { storeSlug: string; offerId: string },
+    path: { storeSlug: string; offerSlug: string },
     body: PurchaseOfferRequest,
   ): Promise<PurchaseOfferResponse> =>
-    t.request<PurchaseOfferResponse>('POST', `/sdk/v1/stores/${enc(path.storeSlug)}/offers/${enc(path.offerId)}/purchase`, body),
+    t.request<PurchaseOfferResponse>('POST', `/sdk/v1/stores/${enc(path.storeSlug)}/offers/${enc(path.offerSlug)}/purchase`, body),
 
   refreshAccessToken: (
     t: Transport,