feat: AutoSSL certificate management tool with Web UI

Dockerfile

@@ -0,0 +1,26 @@
+# AutoSSL Backend
+FROM golang:1.23-alpine AS backend-builder
+WORKDIR /build
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend/ .
+RUN CGO_ENABLED=1 GOOS=linux go build -o /build/autossl .
+
+# Frontend
+FROM node:23-alpine AS frontend-builder
+WORKDIR /build
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ .
+RUN npm run build
+
+# Final image
+FROM alpine:3.20
+RUN apk add --no-cache ca-certificates tzdata
+WORKDIR /app
+COPY --from=backend-builder /build/autossl .
+COPY --from=frontend-builder /build/dist ./dist
+VOLUME ["/app/data"]
+EXPOSE 8080 80
+ENV TZ=Asia/Shanghai
+CMD ["./autossl"]