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

build/Dockerfile

@@ -0,0 +1,34 @@
+FROM golang:1.25-alpine AS builder
+
+LABEL stage=gobuilder
+
+ENV GOPROXY=https://goproxy.cn,direct
+
+WORKDIR /build
+
+COPY go.mod go.sum ./
+
+RUN go mod download
+
+COPY . .
+
+ARG BuildVersion
+ARG BuildTime
+ARG CommitID
+
+RUN go build -o iotlcmupstreamproxy_svc -ldflags "-w -s -X main.BuildVersion=${BuildVersion} -X main.CommitID=${CommitID} -X main.BuildTime=${BuildTime}"
+
+FROM alpine:3.23
+
+RUN apk add --no-cache ca-certificates tzdata
+
+COPY --from=builder /usr/share/zoneinfo/Asia/Shanghai /usr/share/zoneinfo/Asia/Shanghai
+ENV TZ=Asia/Shanghai
+
+EXPOSE 18510
+
+WORKDIR /app
+COPY --from=builder /build/iotlcmupstreamproxy_svc /app/iotlcmupstreamproxy_svc
+COPY --from=builder /build/build/dev_config.yaml /app/config/config.yaml
+
+CMD ["./iotlcmupstreamproxy_svc"]