chore: 初始开源发布

iotlcm-admin-svr：管理后台服务。

- Go module：iotlcm → git.5iot.com/iotlcm-public/iotlcm-admin-svr（729 文件）
- 凭据与地址脱敏：JWT signingKey（含代码里的 MustGet 默认值）、
  MySQL DSN、Redis 口令、告警邮件发件人邮箱全部改为占位；
  私网 IP → 文档地址段；库名 xiujie_admin → iotlcm
- 真实手机号/邮箱 → 合法 11 位编造号 / example.com
- 移除内部资产：CI 触发器、过时 DDL（sql/db_iotlcm.sql）、
  私有依赖 go get 行、明文 registry 登录口令
- 启动 banner 统一 IOTLCM 方块字 + 社区惯例署名
- Dockerfile 改用公共基础镜像
- 拼错的 RADEME.md → README.md，README 重写
- 需要真实数据库的用例改为可用 IOTLCM_TEST_WITH_DB=1 显式启用
- 补 Apache-2.0 LICENSE，LF 行尾 + .gitattributes

数据库 schema 不随本仓发布（生产 DDL 已过时），README 已说明。

server/internal/model/traffic_usage.go

@@ -0,0 +1,91 @@
+package model
+
+import "time"
+
+// TrafficUsageBase contains fields shared by daily and monthly usage records.
+type TrafficUsageBase struct {
+	Iccid       string
+	UsageMb     float64
+	PackageCode string
+}
+
+// TrafficUsageDailyItem represents one card's usage snapshot for one day.
+// Date is normalized to 23:59:59 of that day before writing to TDengine.
+type TrafficUsageDailyItem struct {
+	TrafficUsageBase
+	Date time.Time
+}
+
+// TrafficUsageMonthlyItem represents one card's usage snapshot for one month.
+// Month is normalized to 23:59:59 of the last day of that month before writing to TDengine.
+type TrafficUsageMonthlyItem struct {
+	TrafficUsageBase
+	Month time.Time
+}
+
+// TrafficPoolUsageItem represents one flow pool's usage snapshot.
+type TrafficPoolUsageItem struct {
+	FlowPoolCode string
+	UsageMb      float64
+	Date         time.Time
+}
+
+// TrafficPoolCardCountItem represents one flow pool's card count snapshot.
+type TrafficPoolCardCountItem struct {
+	FlowPoolCode string
+	CardCount    int64
+	Date         time.Time
+}
+
+// TrafficPoolCard is the card data needed for flow pool aggregation.
+type TrafficPoolCard struct {
+	Iccid        string
+	FlowPoolCode string
+}
+
+// TrafficPoolUsageAggregate is the aggregation result for one flow pool.
+type TrafficPoolUsageAggregate struct {
+	FlowPoolCode string
+	UsageMb      float64
+	RecordCount  int64
+}
+
+// TrafficUsageQueryInput filters usage records by ICCID and time range.
+type TrafficUsageQueryInput struct {
+	Iccid     string
+	StartTime time.Time
+	EndTime   time.Time
+	Page      int
+	PageSize  int
+	Asc       bool
+}
+
+// TrafficUsageDeleteInput deletes usage records by ICCID and a required time range.
+type TrafficUsageDeleteInput struct {
+	Iccid     string
+	StartTime time.Time
+	EndTime   time.Time
+}
+
+// TrafficUsageDailyRecord is a daily usage query result row.
+type TrafficUsageDailyRecord struct {
+	Ts          time.Time `json:"ts"`
+	UsageMb     float64   `json:"usageMb"`
+	PackageCode string    `json:"packageCode"`
+	Iccid       string    `json:"iccid"`
+}
+
+// TrafficUsageMonthlyRecord is a monthly usage query result row.
+type TrafficUsageMonthlyRecord struct {
+	Ts          time.Time `json:"ts"`
+	UsageMb     float64   `json:"usageMb"`
+	PackageCode string    `json:"packageCode"`
+	Iccid       string    `json:"iccid"`
+}
+
+// TopUsageCard is one card in the usage ranking.
+type TopUsageCard struct {
+	Iccid    string  `json:"iccid"`
+	UsageMb  float64 `json:"usageMb"`
+	StatDate string  `json:"statDate"`
+}