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/cargo/body.go

@@ -0,0 +1,91 @@
+package cargo
+
+import "encoding/binary"
+
+const (
+	listTypeMain      byte   = 0
+	msgItemListUpdate uint16 = 0x000E
+	msgCeraUpdate     uint16 = 0x0035
+
+	commonUpdateEntrySize = 0x77
+)
+
+type packetWriter struct {
+	data []byte
+}
+
+func (w *packetWriter) writeByte(value byte) {
+	w.data = append(w.data, value)
+}
+
+func (w *packetWriter) writeZero(count int) {
+	if count <= 0 {
+		return
+	}
+	w.data = append(w.data, make([]byte, count)...)
+}
+
+func (w *packetWriter) writeUint16(value uint16) {
+	var buf [2]byte
+	binary.LittleEndian.PutUint16(buf[:], value)
+	w.data = append(w.data, buf[:]...)
+}
+
+func (w *packetWriter) writeInt16(value int16) {
+	w.writeUint16(uint16(value))
+}
+
+func (w *packetWriter) writeInt32(value int32) {
+	var buf [4]byte
+	binary.LittleEndian.PutUint32(buf[:], uint32(value))
+	w.data = append(w.data, buf[:]...)
+}
+
+func (w *packetWriter) bytes() []byte {
+	return append([]byte(nil), w.data...)
+}
+
+func buildSuccessAck() []byte {
+	return []byte{1}
+}
+
+func buildCargoGoldAck(cargoGold int64) []byte {
+	var writer packetWriter
+	writer.writeByte(1)
+	writer.writeInt32(clampInt32(cargoGold))
+	return writer.bytes()
+}
+
+func buildGoldUpdateBody(gold int64) []byte {
+	var writer packetWriter
+	writer.writeByte(listTypeMain)
+	writer.writeUint16(1)
+	writeCommonUpdateEntry(&writer, 0, 0, clampInt32(gold))
+	return writer.bytes()
+}
+
+func buildCeraUpdateBody(cera int64) []byte {
+	var writer packetWriter
+	writer.writeByte(1)
+	writer.writeInt32(clampInt32(cera))
+	writer.writeInt32(0)
+	writer.writeInt32(0)
+	return writer.bytes()
+}
+
+func writeCommonUpdateEntry(writer *packetWriter, slot int16, itemID int32, countOrValue int32) {
+	writer.writeInt16(slot)
+	writer.writeInt32(itemID)
+	writer.writeInt32(countOrValue)
+	writer.writeZero(commonUpdateEntrySize - 2 - 4 - 4)
+}
+
+func clampInt32(value int64) int32 {
+	if value > 2147483647 {
+		return 2147483647
+	}
+	if value < -2147483648 {
+		return -2147483648
+	}
+	return int32(value)
+}