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/logic/handler_metrics.go

@@ -0,0 +1,89 @@
+package logic
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+	"time"
+
+	"longheng.io/server/internal/platform/dispatch"
+)
+
+func (s *Service) observeLoopHandler(meta dispatch.HandlerMeta, msgID uint32, duration time.Duration, err error) {
+	if s == nil || s.metrics == nil {
+		return
+	}
+	result := "ok"
+	if err != nil {
+		result = "error"
+	}
+	labels := map[string]string{
+		"handler": handlerMetricName(meta, msgID),
+		"msg_id":  fmt.Sprint(msgID),
+		"result":  result,
+	}
+	s.incMetric(MetricLogicPlayerLoopHandlerCallsTotal, labels)
+	s.setMetricGaugeMax(MetricLogicPlayerLoopHandlerLatencyMaxMillis, labels, durationMillis(duration))
+}
+
+func handlerMetricName(meta dispatch.HandlerMeta, msgID uint32) string {
+	if name := strings.TrimSpace(meta.Name); name != "" {
+		return name
+	}
+	if msgID != 0 {
+		return fmt.Sprintf("msg_%d", msgID)
+	}
+	return "unknown"
+}
+
+func durationMillis(duration time.Duration) int64 {
+	if duration <= 0 {
+		return 0
+	}
+	millis := duration.Milliseconds()
+	if millis == 0 {
+		return 1
+	}
+	return millis
+}
+
+func (s *Service) setMetricGaugeMax(name string, labels map[string]string, value int64) {
+	if s == nil || s.metrics == nil || name == "" {
+		return
+	}
+	out := s.metricLabels(labels)
+	key := metricSampleKey(name, out)
+	s.handlerMetricMu.Lock()
+	if s.handlerLatencyMax == nil {
+		s.handlerLatencyMax = make(map[string]int64)
+	}
+	current, ok := s.handlerLatencyMax[key]
+	if ok && value <= current {
+		s.handlerMetricMu.Unlock()
+		return
+	}
+	s.handlerLatencyMax[key] = value
+	s.handlerMetricMu.Unlock()
+	s.metrics.SetGauge(name, out, value)
+}
+
+func metricSampleKey(name string, labels map[string]string) string {
+	if len(labels) == 0 {
+		return name
+	}
+	keys := make([]string, 0, len(labels))
+	for key := range labels {
+		keys = append(keys, key)
+	}
+	sort.Strings(keys)
+
+	var b strings.Builder
+	b.WriteString(name)
+	for _, key := range keys {
+		b.WriteByte('\x00')
+		b.WriteString(key)
+		b.WriteByte('=')
+		b.WriteString(labels[key])
+	}
+	return b.String()
+}