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.go

@@ -0,0 +1,151 @@
+package sms
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+)
+
+const (
+	ServiceAliyun  = "1"
+	ServiceTencent = "2"
+)
+
+var (
+	ErrProviderNotFound = errors.New("未选择有效的短信发送供应商")
+	ErrInvalidRequest   = errors.New("短信请求参数不正确")
+)
+
+// Config contains the provider credentials and template configuration.
+// serviceType: 1=Aliyun, 2=Tencent Cloud.
+type Config struct {
+	ServiceType     string `json:"serviceType"     yaml:"serviceType"`
+	RegionID        string `json:"regionId"        yaml:"regionId"`
+	AccessKeyID     string `json:"accessKeyId"     yaml:"accessKeyId"`
+	AccessKeySecret string `json:"accessKeySecret" yaml:"accessKeySecret"`
+	SDKAppID        string `json:"sdkAppId"        yaml:"sdkAppId"`
+	SignName        string `json:"signName"        yaml:"signName"`
+	TemplateID      string `json:"templateId"      yaml:"templateId"`
+}
+
+type Message struct {
+	PhoneNumber string `json:"phoneNumber"`
+	MsgContent  string `json:"msgContent"`
+}
+
+type Result struct {
+	Code    int            `json:"code"`
+	Message string         `json:"message"`
+	Data    map[string]any `json:"data,omitempty"`
+}
+
+type Provider interface {
+	Send(context.Context, Config, Message) (Result, error)
+}
+
+type Registry struct {
+	mu            sync.RWMutex
+	providers     map[string]Provider
+	defaultConfig Config
+}
+
+// NewRegistry 创建一个无默认配置的注册表。
+func NewRegistry() *Registry {
+	return &Registry{providers: make(map[string]Provider)}
+}
+
+// NewRegistryWithDefault 创建一个带默认配置的注册表。调用方请求中未显式提供的字段
+// 将回退到 defaultConfig（例如供应商凭证与签名由短信服务自身环境变量注入）。
+func NewRegistryWithDefault(dc Config) *Registry {
+	return &Registry{providers: make(map[string]Provider), defaultConfig: dc}
+}
+
+func (r *Registry) Register(serviceType string, provider Provider) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.providers[serviceType] = provider
+}
+
+func (r *Registry) Send(ctx context.Context, config Config, message Message) (Result, error) {
+	// 回退默认值：请求中未提供的字段使用短信服务自身的默认配置。
+	config = mergeConfig(r.defaultConfig, config)
+	if err := Validate(config, message); err != nil {
+		return Result{Code: 400, Message: err.Error()}, err
+	}
+
+	r.mu.RLock()
+	provider, ok := r.providers[config.ServiceType]
+	r.mu.RUnlock()
+	if !ok {
+		return Result{Code: 400, Message: ErrProviderNotFound.Error()}, ErrProviderNotFound
+	}
+	return provider.Send(ctx, config, message)
+}
+
+func Validate(config Config, message Message) error {
+	missing := make([]string, 0, 6)
+	if strings.TrimSpace(config.ServiceType) == "" {
+		missing = append(missing, "config.serviceType")
+	}
+	if strings.TrimSpace(config.AccessKeyID) == "" {
+		missing = append(missing, "config.accessKeyId")
+	}
+	if strings.TrimSpace(config.AccessKeySecret) == "" {
+		missing = append(missing, "config.accessKeySecret")
+	}
+	if strings.TrimSpace(config.SignName) == "" {
+		missing = append(missing, "config.signName")
+	}
+	if strings.TrimSpace(config.TemplateID) == "" {
+		missing = append(missing, "config.templateId")
+	}
+	if strings.TrimSpace(message.PhoneNumber) == "" {
+		missing = append(missing, "params.phoneNumber")
+	}
+	if config.ServiceType == ServiceTencent && strings.TrimSpace(config.SDKAppID) == "" {
+		missing = append(missing, "config.sdkAppId")
+	}
+	if len(missing) != 0 {
+		return fmt.Errorf("%w: 缺少 %s", ErrInvalidRequest, strings.Join(missing, ", "))
+	}
+	return nil
+}
+
+// mergeConfig 用 defaultConfig 填充 config 中的空字段，调用方显式值优先。
+func mergeConfig(defaultConfig, config Config) Config {
+	if config.ServiceType == "" {
+		config.ServiceType = defaultConfig.ServiceType
+	}
+	if config.RegionID == "" {
+		config.RegionID = defaultConfig.RegionID
+	}
+	if config.AccessKeyID == "" {
+		config.AccessKeyID = defaultConfig.AccessKeyID
+	}
+	if config.AccessKeySecret == "" {
+		config.AccessKeySecret = defaultConfig.AccessKeySecret
+	}
+	if config.SDKAppID == "" {
+		config.SDKAppID = defaultConfig.SDKAppID
+	}
+	if config.SignName == "" {
+		config.SignName = defaultConfig.SignName
+	}
+	if config.TemplateID == "" {
+		config.TemplateID = defaultConfig.TemplateID
+	}
+	return config
+}
+
+func SplitAndTrim(value, separator string) []string {
+	parts := strings.Split(value, separator)
+	result := make([]string, 0, len(parts))
+	for _, part := range parts {
+		if item := strings.TrimSpace(part); item != "" {
+			result = append(result, item)
+		}
+	}
+	return result
+}