refactor(mock): remove lib/mock fixtures and empty stores

store/wallet.ts

@@ -1,6 +1,5 @@
 import { calculateOrderIncome } from "@/lib/domain/income"
 import { generateId } from "@/lib/id"
-import { mockTransactions, walletBalance } from "@/lib/mock"
 import type { WalletTransaction } from "@/lib/types"
 import { useShopStore } from "@/store/shops"
 import { create } from "zustand"
@@ -17,8 +16,8 @@ interface WalletState {
 }
 
 export const useWalletStore = create<WalletState>((set, get) => ({
-  balance: walletBalance,
-  transactions: mockTransactions,
+  balance: 0,
+  transactions: [],
   topUp: (amount) => {
     if (!Number.isFinite(amount) || amount <= 0) return
     const now = new Date().toISOString()