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/repository/mysql/mysql_bag.go

@@ -0,0 +1,110 @@
+// 本文件实现 DNF 背包仓储的 MySQL 字段化读写。
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"longheng.io/server/internal/modules/dnf/repository"
+)
+
+const mysqlBagTable = "inventories"
+
+type mysqlBagStore struct {
+	mysqlStoreBase
+}
+
+// Load 按角色 ID 从 MySQL 读取 DNF 背包记录。
+func (s *mysqlBagStore) Load(ctx context.Context, characterID string) (repository.InventoryRecord, bool, error) {
+	table, err := s.router.readTable(mysqlBagTable, characterID)
+	if err != nil {
+		return repository.InventoryRecord{}, false, err
+	}
+	itemsTable, err := s.router.readTable(mysqlInventoryItemsTable, characterID)
+	if err != nil {
+		return repository.InventoryRecord{}, false, err
+	}
+	extraTable, err := s.router.readTable(mysqlInventoryExtraTable, characterID)
+	if err != nil {
+		return repository.InventoryRecord{}, false, err
+	}
+	query := s.router.selectQuery("SELECT character_id, updated_at FROM " + table + " WHERE character_id = ?")
+	var record repository.InventoryRecord
+	var updatedAt sql.NullTime
+	err = s.router.db.QueryRowContext(ctx, query, characterID).Scan(
+		&record.CharacterID,
+		&updatedAt,
+	)
+	if err != nil {
+		ok, scanErr := scanErr(err)
+		return repository.InventoryRecord{}, ok, scanErr
+	}
+	record.Slots, err = loadItemStackCollection(
+		ctx, s.router.db, itemsTable, extraTable, "character_id", characterID, "slots", true,
+	)
+	if err != nil {
+		return repository.InventoryRecord{}, false, err
+	}
+	record.Warehouse, err = loadItemStackCollection(
+		ctx, s.router.db, itemsTable, extraTable, "character_id", characterID, "warehouse", true,
+	)
+	if err != nil {
+		return repository.InventoryRecord{}, false, err
+	}
+	record.UpdatedAt = scanTime(updatedAt)
+	return repository.CloneInventory(record), true, nil
+}
+
+// Save 保存完整 DNF 背包记录到 MySQL。
+func (s *mysqlBagStore) Save(ctx context.Context, record repository.InventoryRecord) error {
+	return s.SaveFields(ctx, record, repository.AllInventoryFields()...)
+}
+
+// SaveFields 保存 DNF 背包指定字段到 MySQL。
+// 它只更新 slots 或 warehouse dirty 字段，便于后续异步落库降低写放大。
+func (s *mysqlBagStore) SaveFields(ctx context.Context, record repository.InventoryRecord, fields ...repository.InventoryField) error {
+	characterID, err := requireRecordKey(repository.InventoryKey, record, "inventory")
+	if err != nil {
+		return err
+	}
+	fields = repository.InventoryFields.Normalize(fields)
+	if len(fields) == 0 {
+		return nil
+	}
+	table, err := s.router.writeTable(mysqlBagTable, characterID)
+	if err != nil {
+		return err
+	}
+	itemsTable, err := s.router.writeTable(mysqlInventoryItemsTable, characterID)
+	if err != nil {
+		return err
+	}
+	extraTable, err := s.router.writeTable(mysqlInventoryExtraTable, characterID)
+	if err != nil {
+		return err
+	}
+	columns := []string{"character_id", "updated_at"}
+	args := []any{characterID, timeOrNow(record.UpdatedAt, s.router.now)}
+	updates := []string{updateValue("updated_at")}
+	return withMySQLWriteExecutor(ctx, s.router.db, func(database SQLDB) error {
+		if _, execErr := database.ExecContext(ctx, buildUpsert(table, columns, updates), args...); execErr != nil {
+			return execErr
+		}
+		for _, field := range fields {
+			switch field {
+			case repository.InventoryFieldSlots:
+				if err := replaceItemStackCollection(
+					ctx, database, itemsTable, extraTable, "character_id", characterID, "slots", true, record.Slots,
+				); err != nil {
+					return err
+				}
+			case repository.InventoryFieldWarehouse:
+				if err := replaceItemStackCollection(
+					ctx, database, itemsTable, extraTable, "character_id", characterID, "warehouse", true, record.Warehouse,
+				); err != nil {
+					return err
+				}
+			}
+		}
+		return nil
+	})
+}