小助手内嵌 GM 页：网页重定向 + 物品分页 + 装备强化增幅发放

- 90CN.dll 新增 IE 控件接管，把腾讯小助手页面重定向到本地 GM 页
- gmweb：物品列表改分页（每页 10/20/50，列表固定 6 行高）
- 发放走 grant-options，支持强化 0-31、增幅属性+等级、锻造 0-8、品质
- 服务端补齐 amplify_level：等级统一写入 ext_data0/packed_flag_byte/reinforce/upgrade_level
- 增幅与强化互斥校验，避免写出客户端无法创建的装备

server/internal/services/dnfbridge/gm_tool.go

@@ -324,6 +324,7 @@ type GMMailOptions struct {
 	ExpireDays        int      `json:"expire_days,omitempty"`
 	Reinforce         int      `json:"reinforce,omitempty"`
 	AmplifyType       int      `json:"amplify_type,omitempty"`
+	AmplifyLevel      int      `json:"amplify_level,omitempty"`
 	EquipmentQuality  string   `json:"equipment_quality,omitempty"`
 	Forging           int      `json:"forging,omitempty"`
 	EmblemItemIDs     []uint32 `json:"emblem_item_ids,omitempty"`
@@ -2288,9 +2289,15 @@ func (s *Service) GMSendItemMailWithOptions(
 		return GMMailDeliveryResult{}, fmt.Errorf("%w: equipment mail count must be 1", ErrGMInvalidRequest)
 	}
 	quality := strings.ToLower(strings.TrimSpace(options.EquipmentQuality))
-	if options.ExpireDays < 0 || options.ExpireDays > 3650 || options.Reinforce < 0 || options.Reinforce > 31 || options.AmplifyType < 0 || options.AmplifyType > 4 || options.Forging < 0 || options.Forging > 8 {
+	if options.ExpireDays < 0 || options.ExpireDays > 3650 || options.Reinforce < 0 || options.Reinforce > 31 || options.AmplifyType < 0 || options.AmplifyType > 4 || options.AmplifyLevel < 0 || options.AmplifyLevel > 31 || options.Forging < 0 || options.Forging > 8 {
 		return GMMailDeliveryResult{}, fmt.Errorf("%w: expire_days, reinforce, amplify_type or forging is out of range", ErrGMInvalidRequest)
 	}
+	if options.AmplifyType == 0 && options.AmplifyLevel != 0 {
+		return GMMailDeliveryResult{}, fmt.Errorf("%w: amplify_level requires amplify_type", ErrGMInvalidRequest)
+	}
+	if options.AmplifyType > 0 && options.Reinforce != 0 {
+		return GMMailDeliveryResult{}, fmt.Errorf("%w: reinforce and amplify are mutually exclusive", ErrGMInvalidRequest)
+	}
 	if quality != "" && quality != "default" && quality != "random" && quality != "top" {
 		return GMMailDeliveryResult{}, fmt.Errorf("%w: equipment_quality must be default, random or top", ErrGMInvalidRequest)
 	}
@@ -2345,10 +2352,17 @@ func (s *Service) GMSendItemMailWithOptions(
 			stack.Extra["durability"] = strconv.FormatUint(uint64(definition.Durability), 10)
 			stack.Extra["max_durability"] = strconv.FormatUint(uint64(definition.Durability), 10)
 		}
-		if options.Reinforce > 0 {
-			value := strconv.Itoa(options.Reinforce)
-			stack.Extra["reinforce"] = value
-			stack.Extra["ext_data0"] = value
+		// 等级字节只写一次：带增幅时它表示增幅等级，否则是强化等级。
+		level := options.Reinforce
+		if options.AmplifyType > 0 {
+			level = options.AmplifyLevel
+		}
+		if level > 0 {
+			levelText := strconv.Itoa(level)
+			stack.Extra["ext_data0"] = levelText
+			stack.Extra["packed_flag_byte"] = levelText
+			stack.Extra["reinforce"] = levelText
+			stack.Extra["upgrade_level"] = levelText
 		}
 		if options.AmplifyType > 0 {
 			// An amplification option is only real to the game once the row