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/pkg/serializer/serializer.go

@@ -0,0 +1,179 @@
+package serializer
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"sort"
+	"strings"
+	"sync"
+
+	"google.golang.org/protobuf/proto"
+)
+
+var (
+	ErrUnknownSerializer = errors.New("unknown serializer")
+	ErrInvalidTarget     = errors.New("invalid serializer target")
+)
+
+type Serializer interface {
+	Name() string
+	Marshal(any) ([]byte, error)
+	Unmarshal([]byte, any) error
+}
+
+type Registry struct {
+	mu          sync.RWMutex
+	serializers map[string]Serializer
+}
+
+func NewRegistry(serializers ...Serializer) *Registry {
+	r := &Registry{serializers: make(map[string]Serializer)}
+	for _, serializer := range serializers {
+		_ = r.Register(serializer)
+	}
+	return r
+}
+
+func (r *Registry) Register(serializer Serializer) error {
+	if serializer == nil {
+		return ErrUnknownSerializer
+	}
+	name := normalizeName(serializer.Name())
+	if name == "" {
+		return ErrUnknownSerializer
+	}
+	r.mu.Lock()
+	r.serializers[name] = serializer
+	r.mu.Unlock()
+	return nil
+}
+
+func (r *Registry) Get(name string) (Serializer, bool) {
+	if r == nil {
+		return nil, false
+	}
+	name = normalizeName(name)
+	r.mu.RLock()
+	serializer, ok := r.serializers[name]
+	r.mu.RUnlock()
+	return serializer, ok
+}
+
+func (r *Registry) MustGet(name string) (Serializer, error) {
+	serializer, ok := r.Get(name)
+	if !ok {
+		return nil, fmt.Errorf("%w: %s", ErrUnknownSerializer, name)
+	}
+	return serializer, nil
+}
+
+func (r *Registry) Names() []string {
+	if r == nil {
+		return nil
+	}
+	r.mu.RLock()
+	names := make([]string, 0, len(r.serializers))
+	for name := range r.serializers {
+		names = append(names, name)
+	}
+	r.mu.RUnlock()
+	sort.Strings(names)
+	return names
+}
+
+type JSON struct{}
+
+func (JSON) Name() string { return "json" }
+
+func (JSON) Marshal(value any) ([]byte, error) {
+	return json.Marshal(value)
+}
+
+func (JSON) Unmarshal(data []byte, target any) error {
+	if target == nil {
+		return ErrInvalidTarget
+	}
+	return json.Unmarshal(data, target)
+}
+
+type Raw struct{}
+
+func (Raw) Name() string { return "raw" }
+
+func (Raw) Marshal(value any) ([]byte, error) {
+	switch typed := value.(type) {
+	case []byte:
+		return append([]byte(nil), typed...), nil
+	case string:
+		return []byte(typed), nil
+	default:
+		return nil, fmt.Errorf("%w: raw serializer requires []byte or string", ErrInvalidTarget)
+	}
+}
+
+func (Raw) Unmarshal(data []byte, target any) error {
+	switch typed := target.(type) {
+	case *[]byte:
+		if typed == nil {
+			return ErrInvalidTarget
+		}
+		*typed = append((*typed)[:0], data...)
+		return nil
+	case *string:
+		if typed == nil {
+			return ErrInvalidTarget
+		}
+		*typed = string(data)
+		return nil
+	default:
+		return fmt.Errorf("%w: raw serializer target must be *[]byte or *string", ErrInvalidTarget)
+	}
+}
+
+type Protobuf struct {
+	DiscardUnknown bool
+}
+
+func (Protobuf) Name() string { return "protobuf" }
+
+func (Protobuf) Marshal(value any) ([]byte, error) {
+	msg, ok := value.(proto.Message)
+	if !ok {
+		return nil, fmt.Errorf("%w: protobuf serializer requires proto.Message", ErrInvalidTarget)
+	}
+	return proto.Marshal(msg)
+}
+
+func (p Protobuf) Unmarshal(data []byte, target any) error {
+	if target == nil {
+		return ErrInvalidTarget
+	}
+	msg, ok := target.(proto.Message)
+	if !ok {
+		return fmt.Errorf("%w: protobuf serializer target must be proto.Message", ErrInvalidTarget)
+	}
+	// 协议层已经限制单包大小；这里再限制嵌套深度，避免恶意递归消息拖垮解码栈。
+	return proto.UnmarshalOptions{
+		DiscardUnknown: p.DiscardUnknown,
+		RecursionLimit: 32,
+	}.Unmarshal(data, msg)
+}
+
+type LenientProtobuf struct{}
+
+func (LenientProtobuf) Name() string { return "protobuf_lenient" }
+
+func (LenientProtobuf) Marshal(value any) ([]byte, error) {
+	return (Protobuf{}).Marshal(value)
+}
+
+func (LenientProtobuf) Unmarshal(data []byte, target any) error {
+	return (Protobuf{DiscardUnknown: true}).Unmarshal(data, target)
+}
+
+var DefaultRegistry = NewRegistry(JSON{}, Raw{}, Protobuf{}, LenientProtobuf{})
+
+func normalizeName(name string) string {
+	return strings.ToLower(strings.TrimSpace(name))
+}