chore: 初始开源发布

iotlcm-upstream-proxy：渠道缓存与转发网关。

- 内联原私有依赖：yunze-public → internal/pub/（18 文件），
  yunze-pb/pb → internal/pb/（9 文件）；Consul 注册改用官方
  gogf/gf/contrib/registry/consul/v2（API 兼容）
- Go module：yz-svr → git.5iot.com/iotlcm-public/iotlcm-upstream-proxy
- 凭据与内部标识脱敏：MySQL/Redis/Consul 凭据、私网与生产 IP、内网域名
- 移除内部资产：CI 触发器
- Dockerfile 改用公共基础镜像，移除写死的 registry 凭据
- 补 Apache-2.0 LICENSE，重写 README，LF 行尾 + .gitattributes

internal/logic/upstreamapi/errcode_test.go

@@ -0,0 +1,61 @@
+package upstreamapi
+
+import (
+	"context"
+	"encoding/json"
+	"strings"
+	"testing"
+
+	"git.5iot.com/iotlcm-public/iotlcm-upstream-proxy/internal/model"
+)
+
+type errCodeTestChannel struct {
+	response model.SimBaseResJson
+}
+
+func (f *errCodeTestChannel) SimBase(context.Context, *model.SimBaseReqJson) (model.SimBaseResJson, error) {
+	return f.response, nil
+}
+
+func TestSimBasePreservesCarrierErrCode(t *testing.T) {
+	const payload = `{"code":0,"message":"success","data":[{"code":9999,"message":"http status 797","errCode":"S00004","simKey":{"chanKey":"channel_003","iccid":"8986112520409968013"},"resData":{}}]}`
+
+	var upstream model.SimResponseData[model.SimBaseResJson]
+	if err := json.Unmarshal([]byte(payload), &upstream); err != nil {
+		t.Fatal(err)
+	}
+	if len(upstream.Data) != 1 {
+		t.Fatalf("decoded results = %d, want 1", len(upstream.Data))
+	}
+	if upstream.Data[0].ErrCode != "S00004" {
+		t.Fatalf("decoded errCode = %q, want S00004", upstream.Data[0].ErrCode)
+	}
+
+	api := NewUpstreamAPI()
+	api.RegisterChan("channel_003", "test", &model.SimCardChannelCache{
+		Instance: &errCodeTestChannel{response: upstream.Data},
+	})
+	output, err := api.SimBase(context.Background(), &model.SimBaseReqJson{
+		SimKeys: []*model.SimKey{{
+			ChanKey: "channel_003",
+			ICCID:   "8986112520409968013",
+		}},
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(output) != 1 {
+		t.Fatalf("proxied results = %d, want 1", len(output))
+	}
+	if output[0].ErrCode != "S00004" {
+		t.Fatalf("proxied errCode = %q, want S00004", output[0].ErrCode)
+	}
+
+	encoded, err := json.Marshal(output)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(string(encoded), `"errCode":"S00004"`) {
+		t.Fatalf("serialized response dropped errCode: %s", encoded)
+	}
+}