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/logic/simwarning/expire_config.go

@@ -0,0 +1,43 @@
+package simwarning
+
+import (
+	"context"
+
+	"github.com/gogf/gf/v2/frame/g"
+)
+
+const (
+	defaultExpireFirstWarnDays  = 30
+	defaultExpireSecondWarnDays = 15
+	defaultExpireThirdWarnDays  = 7
+)
+
+type expireWarnThresholds struct {
+	First  float64
+	Second float64
+	Third  float64
+}
+
+func systemExpireWarnThresholds(ctx context.Context) expireWarnThresholds {
+	first := g.Cfg().MustGet(ctx, "warning.expire.firstWarnDays", defaultExpireFirstWarnDays).Int()
+	second := g.Cfg().MustGet(ctx, "warning.expire.secondWarnDays", defaultExpireSecondWarnDays).Int()
+	third := g.Cfg().MustGet(ctx, "warning.expire.thirdWarnDays", defaultExpireThirdWarnDays).Int()
+	if first <= 0 || second <= 0 || third <= 0 || !(first > second && second > third) {
+		g.Log().Warningf(ctx, "SimWarning expire threshold config invalid, first:%d, second:%d, third:%d, use default:%d/%d/%d",
+			first,
+			second,
+			third,
+			defaultExpireFirstWarnDays,
+			defaultExpireSecondWarnDays,
+			defaultExpireThirdWarnDays,
+		)
+		first = defaultExpireFirstWarnDays
+		second = defaultExpireSecondWarnDays
+		third = defaultExpireThirdWarnDays
+	}
+	return expireWarnThresholds{
+		First:  float64(first),
+		Second: float64(second),
+		Third:  float64(third),
+	}
+}