feat: 完善后端脚手架基础能力

Dockerfile

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+FROM golang:1.25-alpine AS builder
+
+RUN apk add --no-cache build-base
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=1 go build -trimpath -ldflags="-s -w" -o /out/skeleton .
+
+FROM alpine:3.22
+RUN apk add --no-cache ca-certificates tzdata && adduser -D -H -u 10001 app
+WORKDIR /app
+COPY --from=builder /out/skeleton /app/skeleton
+COPY config /app/config
+RUN mkdir -p /app/data && chown -R app:app /app
+USER app
+EXPOSE 8080
+ENTRYPOINT ["/app/skeleton"]