feat(admin): 添加APK管理功能

实现APK文件的上传、下载和列表功能
- 新增APKInfo数据结构
- 添加/admin/apk/upload、/admin/apk/download和/admin/apk/list路由
- 实现APK存储服务方法
- 添加相关测试用例

internal/service/update_service.go

@@ -14,6 +14,7 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
+	"io"
 	"mime"
 	"os"
 	"path/filepath"
@@ -67,6 +68,18 @@ func (s *UpdateService) ListReleases(runtimeVersion string) ([]model.ReleaseInfo
 	return s.store.ListReleases(runtimeVersion)
 }
 
+func (s *UpdateService) SaveAPK(runtimeVersion string, reader io.Reader) (string, error) {
+	return s.store.SaveAPK(runtimeVersion, reader)
+}
+
+func (s *UpdateService) GetAPKPath(runtimeVersion string) (string, error) {
+	return s.store.GetAPKPath(runtimeVersion)
+}
+
+func (s *UpdateService) ListAPKs() ([]model.APKInfo, error) {
+	return s.store.ListAPKs()
+}
+
 func (s *UpdateService) BuildManifestResponse(req ManifestRequest) (ManifestResponse, error) {
 	releasePath, err := s.store.LatestReleasePath(req.RuntimeVersion, req.Platform)
 	if err != nil {
@@ -338,4 +351,3 @@ func BuildMultipartMixed(parts []MultipartPart) ([]byte, string, error) {
 	buf.WriteString("--" + boundary + "--")
 	return buf.Bytes(), "multipart/mixed; boundary=" + boundary, nil
 }
-