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/platform/metrics/business.go

@@ -0,0 +1,150 @@
+package metrics
+
+import (
+	"strings"
+	"time"
+)
+
+// 这些名称是框架层的最低共同语言，避免每个项目自造一套不可聚合的运营指标。
+const (
+	REDRequestsMetric = "requests_total"
+	REDErrorsMetric   = "errors_total"
+	REDDurationMetric = "request_duration"
+
+	OnlinePlayersMetric       = "online_players"
+	LoginEventsMetric         = "login_events_total"
+	PaymentEventsMetric       = "payment_events_total"
+	PaymentAmountMicrosMetric = "payment_amount_micros_total"
+	RetentionEventsMetric     = "retention_events_total"
+)
+
+// RED 把 rate、errors、duration 绑定到同一套 label 约束，避免 SLO 口径漂移。
+type RED struct {
+	scope    Scope
+	service  string
+	duration *Histogram
+}
+
+type REDOptions struct {
+	Buckets []float64
+}
+
+func NewRED(scope Scope, service string, opts REDOptions) *RED {
+	service = strings.TrimSpace(service)
+	if service == "" {
+		service = "default"
+	}
+	baseLabels := map[string]string{"service": service}
+	histogram := NewHistogram(scope, REDDurationMetric, HistogramOptions{
+		Buckets: opts.Buckets,
+		Labels:  baseLabels,
+	})
+	return &RED{
+		scope:    scope.WithLabels(baseLabels),
+		service:  service,
+		duration: histogram,
+	}
+}
+
+func (r *RED) Record(route string, code string, elapsed time.Duration) {
+	if r == nil {
+		return
+	}
+	route = sanitizeLabelValue(route, "unknown")
+	code = sanitizeLabelValue(code, "OK")
+	labels := map[string]string{"route": route, "code": code}
+	r.scope.Inc(REDRequestsMetric, labels)
+	if isErrorCode(code) {
+		r.scope.Inc(REDErrorsMetric, labels)
+	}
+	if elapsed < 0 {
+		elapsed = 0
+	}
+	if r.duration != nil {
+		r.duration.ObserveWithLabels(elapsed.Seconds(), labels)
+	}
+}
+
+func (r *RED) RecordError(route string, code string, elapsed time.Duration) {
+	if strings.TrimSpace(code) == "" {
+		code = "INTERNAL_ERR"
+	}
+	r.Record(route, code, elapsed)
+}
+
+func (r *RED) Service() string {
+	if r == nil {
+		return ""
+	}
+	return r.service
+}
+
+func isErrorCode(code string) bool {
+	upper := strings.ToUpper(strings.TrimSpace(code))
+	if upper == "" || upper == "OK" {
+		return false
+	}
+	if strings.HasPrefix(upper, "ERR") {
+		return true
+	}
+	switch upper {
+	case "FAIL", "FAILED", "INTERNAL_ERR", "TIMEOUT", "PANIC":
+		return true
+	}
+	return len(upper) == 3 && upper[0] == '5'
+}
+
+// OnlinePlayers 固定 segment、region、server_id 三个维度，避免在线人数指标被 user_id 拉爆。
+type OnlinePlayers struct {
+	scope Scope
+}
+
+func NewOnlinePlayers(scope Scope, service string) *OnlinePlayers {
+	service = strings.TrimSpace(service)
+	if service == "" {
+		service = "default"
+	}
+	return &OnlinePlayers{
+		scope: scope.WithLabels(map[string]string{"service": service}),
+	}
+}
+
+func (o *OnlinePlayers) Set(segment, region, serverID string, count int64) {
+	if o == nil {
+		return
+	}
+	labels := map[string]string{
+		"segment":   sanitizeLabelValue(segment, "all"),
+		"region":    sanitizeLabelValue(region, "any"),
+		"server_id": sanitizeLabelValue(serverID, "any"),
+	}
+	o.scope.SetGauge(OnlinePlayersMetric, labels, count)
+}
+
+func (o *OnlinePlayers) Add(segment, region, serverID string, delta int64) {
+	if o == nil {
+		return
+	}
+	labels := map[string]string{
+		"segment":   sanitizeLabelValue(segment, "all"),
+		"region":    sanitizeLabelValue(region, "any"),
+		"server_id": sanitizeLabelValue(serverID, "any"),
+	}
+	o.scope.AddGauge(OnlinePlayersMetric, labels, delta)
+}
+
+func sanitizeLabelValue(value string, fallback string) string {
+	value = strings.TrimSpace(value)
+	if value == "" {
+		return fallback
+	}
+	if len(value) > 64 {
+		return fallback
+	}
+	for _, r := range value {
+		if r < 0x20 {
+			return fallback
+		}
+	}
+	return value
+}