feat: init mirror-proxy project

- Docker Hub / GHCR / GitHub reverse proxy
- Web admin panel with link management
- Dynamic admin path, user and password config
- Rate limiting per link (dual/single auth mode)
- Docker and docker-compose deployment support
- GitHub Actions workflow for auto-publish to GHCR

Dockerfile

@@ -0,0 +1,30 @@
+# 构建阶段
+FROM golang:1.23-alpine AS builder
+
+WORKDIR /app
+COPY go.mod go.sum* ./
+RUN go mod download 2>/dev/null || true
+
+COPY . .
+RUN go build -ldflags="-s -w" -o mirror-proxy ./cmd/main.go
+
+# 运行阶段
+FROM alpine:latest
+
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /app
+
+# 创建必要目录
+RUN mkdir -p web/static cache
+
+# 复制编译后的二进制文件和静态资源
+COPY --from=builder /app/mirror-proxy .
+COPY --from=builder /app/web/static ./web/static
+
+# 暴露默认端口
+EXPOSE 8080
+
+VOLUME ["/app/cache"]
+
+ENTRYPOINT ["./mirror-proxy"]