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/services/dnfbridge/avatar_option_change_protocol.go

@@ -0,0 +1,65 @@
+package dnfbridge
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+)
+
+const currentAvatarOptionChangeRequestSize = 13
+
+var (
+	errCurrentAvatarOptionChangeRequestInvalid = errors.New("dnf current avatar option change request is invalid")
+	errCurrentAvatarOptionChangeUnavailable    = errors.New("dnf current avatar option change owner or PVF mapping is unavailable")
+	errCurrentAvatarOptionChangeToolInvalid    = errors.New("dnf current avatar option change tool is invalid")
+	errCurrentAvatarOptionChangeTargetInvalid  = errors.New("dnf current avatar option change target is invalid")
+)
+
+// currentAvatarOptionChangeRequest is the current client's class-1/op459
+// body. The trailing ability selector is one byte in this client build; the
+// class-1/op459 result echoes the same byte after the selected avatar slot.
+type currentAvatarOptionChangeRequest struct {
+	SourceSlot   int16
+	SourceItemID uint32
+	TargetSlot   int16
+	TargetItemID uint32
+	AbilityNo    byte
+}
+
+type currentAvatarOptionChangeResult struct {
+	SourceRemaining int64
+}
+
+func parseCurrentAvatarOptionChangeRequest(body []byte) (currentAvatarOptionChangeRequest, error) {
+	if len(body) != currentAvatarOptionChangeRequestSize {
+		return currentAvatarOptionChangeRequest{}, fmt.Errorf("%w: body=%d", errCurrentAvatarOptionChangeRequestInvalid, len(body))
+	}
+	sourceSlot := binary.LittleEndian.Uint16(body[0:2])
+	sourceItemID := binary.LittleEndian.Uint32(body[2:6])
+	targetSlot := binary.LittleEndian.Uint16(body[6:8])
+	targetItemID := binary.LittleEndian.Uint32(body[8:12])
+	if sourceSlot > 0x7fff || targetSlot > 0x7fff || sourceItemID == 0 || targetItemID == 0 {
+		return currentAvatarOptionChangeRequest{}, errCurrentAvatarOptionChangeRequestInvalid
+	}
+	return currentAvatarOptionChangeRequest{
+		SourceSlot:   int16(sourceSlot),
+		SourceItemID: sourceItemID,
+		TargetSlot:   int16(targetSlot),
+		TargetItemID: targetItemID,
+		AbilityNo:    body[12],
+	}, nil
+}
+
+func buildCurrentAvatarOptionChangeSuccessBody(request currentAvatarOptionChangeRequest) []byte {
+	var body packetWriter
+	body.writeByte(1)
+	body.writeUint16(uint16(request.TargetSlot))
+	body.writeByte(request.AbilityNo)
+	return body.bytes()
+}
+
+func currentAvatarOptionChangeFailureBody() []byte {
+	// The native class-1 generic failure reader consumes an opaque error byte
+	// after success=0. Its business mapping is not closed, so keep it zero.
+	return []byte{0, 0}
+}