feat: 完成用户微服务 gRPC 实现，包含数据库与服务启动逻辑

backend/services/user-svc/Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.26.1-alpine3.23 AS builder
+
+WORKDIR /app
+
+COPY go.mod ./
+COPY main.go ./
+COPY user.proto ./
+
+RUN go mod download
+RUN go install google.golang.org/protobuf/cmd/protoc-gen-go@latest
+RUN go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@latest
+RUN protoc --go_out=. --go-grpc_out=. user.proto
+RUN go build -o user-svc main.go
+
+FROM alpine:latest
+
+WORKDIR /app
+
+COPY --from=builder /app/user-svc .
+
+EXPOSE 50051
+
+CMD ["./user-svc"]