refactor: remove proxy API (#1596)

pkg/base/github_mirror.go

@@ -0,0 +1,11 @@
+package base
+
+import "github.com/GopeedLab/gopeed/internal/githubmirror"
+
+// Preserve downloader configuration type names and the existing JSON schema.
+type GithubMirror = githubmirror.Mirror
+type GithubMirrorConfig = githubmirror.Config
+
+func DefaultGithubMirrorConfig() *GithubMirrorConfig {
+	return githubmirror.DefaultConfig()
+}