chore: 初始开源发布

iotlcm-sms：独立短信 HTTP/gRPC 服务，支持阿里云与腾讯云。

- Go module 迁移至 git.5iot.com/iotlcm-public/iotlcm-sms
- 补 Apache-2.0 LICENSE，重写 README（特性/配置/接口/部署/目录/测试）
- 配置改为 config.example.yaml + SMS_* 环境变量注入，仓库不含真实凭证
- 清理内部标识（私有镜像仓库 / 公司名 / 客户签名 / 真实模板ID / 真实手机号）
- 统一 LF 行尾并加 .gitattributes

internal/sms/sms_test.go

@@ -0,0 +1,43 @@
+package sms
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+type stubProvider struct{ called bool }
+
+func (p *stubProvider) Send(context.Context, Config, Message) (Result, error) {
+	p.called = true
+	return Result{Code: 0, Message: "ok"}, nil
+}
+
+func TestRegistrySend(t *testing.T) {
+	provider := &stubProvider{}
+	registry := NewRegistry()
+	registry.Register(ServiceAliyun, provider)
+	config := Config{
+		ServiceType: ServiceAliyun, AccessKeyID: "id", AccessKeySecret: "secret",
+		SignName: "sign", TemplateID: "template",
+	}
+	result, err := registry.Send(context.Background(), config, Message{PhoneNumber: "138****8000"})
+	if err != nil || result.Code != 0 || !provider.called {
+		t.Fatalf("result=%+v err=%v called=%v", result, err, provider.called)
+	}
+}
+
+func TestRegistryValidatesBeforeProvider(t *testing.T) {
+	registry := NewRegistry()
+	_, err := registry.Send(context.Background(), Config{ServiceType: ServiceTencent}, Message{})
+	if !errors.Is(err, ErrInvalidRequest) {
+		t.Fatalf("err = %v, want ErrInvalidRequest", err)
+	}
+}
+
+func TestSplitAndTrim(t *testing.T) {
+	got := SplitAndTrim(" 138****8000, ,138****8000 ", ",")
+	if len(got) != 2 || got[0] != "138****8000" || got[1] != "138****8000" {
+		t.Fatalf("unexpected split result: %#v", got)
+	}
+}