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/mail/system_owner_test.go

@@ -0,0 +1,94 @@
+package mail
+
+import (
+	"context"
+	"testing"
+
+	dnfrepo "longheng.io/server/internal/modules/dnf/repository"
+	dnfrepomemory "longheng.io/server/internal/modules/dnf/repository/memory"
+)
+
+func TestSystemMailOwnerCommitsGoldAndAttachmentThroughMailboxUnitOfWork(t *testing.T) {
+	ctx := context.Background()
+	repositories := dnfrepomemory.NewMemoryGroup()
+	if err := repositories.Character.Save(ctx, dnfrepo.CharacterRecord{
+		CharacterID: "7",
+		AccountID:   "dnf:test",
+		Name:        "Receiver",
+	}); err != nil {
+		t.Fatal(err)
+	}
+	result, err := NewOwner(repositories).SendSystem(ctx, SystemSendRequest{
+		RecipientName: "Receiver",
+		Title:         "GM delivery",
+		Body:          "Native mailbox transaction",
+		Gold:          1234,
+		Attachments: []dnfrepo.MailAttachment{{
+			ItemID: 3227,
+			Count:  5,
+			Bind:   true,
+		}},
+		Source: "gm_admin_system_mail",
+	})
+	if err != nil {
+		t.Fatalf("SendSystem() error = %v", err)
+	}
+	if result.MailID != "1" || result.RecipientCharacterID != "7" || result.RecipientName != "Receiver" {
+		t.Fatalf("SendSystem() = %+v", result)
+	}
+	mailbox, found, err := repositories.Mailbox.Load(ctx, "7")
+	if err != nil || !found {
+		t.Fatalf("load mailbox found=%t error=%v", found, err)
+	}
+	got := mailbox.Mails["1"]
+	if got.Gold != 1234 || got.SenderName != "系统" || got.RecipientName != "Receiver" ||
+		len(got.Attachments) != 1 || got.Attachments[0].ItemID != 3227 || got.Attachments[0].Count != 5 ||
+		got.Metadata["system_mail"] != "true" || got.Metadata["unlimited"] != "true" {
+		t.Fatalf("durable system mail = %+v", got)
+	}
+}
+
+func TestSystemMailOwnerRejectsMismatchedRecipientSelector(t *testing.T) {
+	ctx := context.Background()
+	repositories := dnfrepomemory.NewMemoryGroup()
+	if err := repositories.Character.Save(ctx, dnfrepo.CharacterRecord{CharacterID: "7", Name: "Receiver"}); err != nil {
+		t.Fatal(err)
+	}
+	_, err := NewOwner(repositories).SendSystem(ctx, SystemSendRequest{
+		RecipientCharacterID: "7",
+		RecipientName:        "Different",
+		Body:                 "should fail",
+		Source:               "gm_admin_system_mail",
+	})
+	if err == nil {
+		t.Fatal("SendSystem() accepted mismatched character id and name")
+	}
+	if _, found, loadErr := repositories.Mailbox.Load(ctx, "7"); loadErr != nil || found {
+		t.Fatalf("mismatched request changed mailbox found=%t error=%v", found, loadErr)
+	}
+}
+
+func TestSystemMailOwnerCompletionKeyReplaysOneAuctionPayoutMail(t *testing.T) {
+	ctx := context.Background()
+	repositories := dnfrepomemory.NewMemoryGroup()
+	if err := repositories.Character.Save(ctx, dnfrepo.CharacterRecord{CharacterID: "7", Name: "Receiver"}); err != nil {
+		t.Fatal(err)
+	}
+	request := SystemSendRequest{
+		RecipientCharacterID: "7", RecipientName: "Receiver", Title: "拍卖行成交款",
+		Gold: 150, Source: "auction_sale_proceeds", CompletionKey: "auction:payout:17:0",
+	}
+	first, err := NewOwner(repositories).SendSystem(ctx, request)
+	if err != nil {
+		t.Fatal(err)
+	}
+	second, err := NewOwner(repositories).SendSystem(ctx, request)
+	if err != nil {
+		t.Fatal(err)
+	}
+	mailbox, found, err := repositories.Mailbox.Load(ctx, "7")
+	if err != nil || !found || first.MailID != second.MailID || len(mailbox.Mails) != 1 ||
+		mailbox.Mails[first.MailID].Metadata["completion_key"] != request.CompletionKey {
+		t.Fatalf("first=%+v second=%+v found=%t err=%v mailbox=%+v", first, second, found, err, mailbox)
+	}
+}