DNF90 服务端与启动器完整源码（含 GM 工具功能增强）

服务端（Go）：
- GM 塞背包/带属性装备发放：在线角色推送 op14 增量物品行，背包实时刷新，无需回角色选择界面
- GM 改金币/改等级：去掉在线拒绝，落库后推送 op14 钱包/op37 等级状态，在线实时刷新
- 等级端点统一切换到新版 GMSetCharacterLevel（自带在线刷新）
- 无限/锁死疲劳模式 + 燃烧疲劳：每房间消耗 2 点、打怪与通关经验双倍
- 燃烧疲劳开关时给所有在线角色推送系统提示（op12 mode 0）
- 深渊史诗掉率：GM 全局倍率 + 城镇增益药剂窗口倍率，真实接入掉落结算

启动器（Python/JS）：
- 标题栏自绘、窗口 1204x717、禁止拖拽改大小、仅最小化/关闭
- GM 工具：疲劳与燃烧、深渊史诗掉率、拍卖行上架（单一定价对齐）
- 拍卖行上架前端对齐服务端单一价格语义，修复 400 报错

server/internal/modules/dnf/protocol/legacy_channel_test.go

@@ -0,0 +1,56 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"testing"
+
+	"longheng.io/server/internal/modules/dnf/dnfenum"
+)
+
+func TestDofLoginAckUsesLegacyPrefixAndKey(t *testing.T) {
+	ack := BuildDofLoginAck("20260629000006")
+	if len(ack) != 47 {
+		t.Fatalf("ack len = %d, want 47", len(ack))
+	}
+	if ack[0] != dnfenum.ChannelPacketClass || ack[1] != legacyMsgID(dnfenum.LegacyMsgDofLoginAck) {
+		t.Fatalf("ack header = %x", ack[:LegacyChannelHeaderSize])
+	}
+	if got := binary.LittleEndian.Uint32(ack[2:6]); got != uint32(len(ack)) {
+		t.Fatalf("ack len field = %d, want %d", got, len(ack))
+	}
+	if got := string(bytes.TrimRight(ack[15:], "\x00")); got != "20260629000006" {
+		t.Fatalf("ack key = %q", got)
+	}
+}
+
+func TestDofLegacyPrefixDetection(t *testing.T) {
+	preface := make([]byte, DofLoginPrefaceSize)
+	copy(preface, BuildLegacyClientPacket(dnfenum.LegacyMsgDofLoginPreface, nil))
+	if !IsDofLoginPrefacePrefix(preface) {
+		t.Fatal("expected login preface prefix")
+	}
+	if IsDofAskChannelPrefix(preface) {
+		t.Fatal("login preface must not match ask channel")
+	}
+
+	ask := make([]byte, DofAskChannelSize)
+	copy(ask, BuildLegacyClientPacket(dnfenum.LegacyMsgAskChannelInfo, nil))
+	if !IsDofAskChannelPrefix(ask) {
+		t.Fatal("expected ask channel prefix")
+	}
+}
+
+func TestLegacyHeaderUsesActualPacketLength(t *testing.T) {
+	packet := BuildLegacyChannelPacket(dnfenum.LegacyMsgChannelInfo, []byte{1, 2, 3})
+	if packet[1] != legacyMsgID(dnfenum.LegacyMsgChannelInfo) {
+		t.Fatalf("msg id = %d", packet[1])
+	}
+	if got := binary.LittleEndian.Uint32(packet[2:6]); got != uint32(len(packet)) {
+		t.Fatalf("len field = %d, want %d", got, len(packet))
+	}
+}
+
+func legacyMsgID(msg dnfenum.LegacyChannelMsg) byte {
+	return byte(uint16(msg))
+}