fix(test): initialize ErupeConfig in cafe item tests

Required after cherry-picking 3d0114c which added RealClientMode check.

network/mhfpacket/msg_mhf_acquire_cafe_item_test.go

@@ -5,10 +5,18 @@ import (
 	"testing"
 
 	"erupe-ce/common/byteframe"
+	"erupe-ce/config"
 	"erupe-ce/network"
 	"erupe-ce/network/clientctx"
 )
 
+func init() {
+	// Initialize ErupeConfig for tests that access it
+	config.ErupeConfig = &config.Config{
+		RealClientMode: config.ZZ, // Default to ZZ for tests
+	}
+}
+
 func TestMsgMhfAcquireCafeItemOpcode(t *testing.T) {
 	pkt := &MsgMhfAcquireCafeItem{}
 	if pkt.Opcode() != network.MSG_MHF_ACQUIRE_CAFE_ITEM {