feat(proxy): add proxy module

proxy/single_provider.go

@@ -0,0 +1,19 @@
+package proxy
+
+// SingleProxyProvider 单个代理提供者（不使用IP池）
+type SingleProxyProvider struct {
+	proxyURL string
+}
+
+// NewSingleProxyProvider 创建单个代理提供者
+func NewSingleProxyProvider(proxyURL string) *SingleProxyProvider {
+	return &SingleProxyProvider{proxyURL: proxyURL}
+}
+
+func (p *SingleProxyProvider) GetIPList() ([]ProxyIP, error) {
+	return []ProxyIP{{IP: p.proxyURL}}, nil
+}
+
+func (p *SingleProxyProvider) RefreshIPList() ([]ProxyIP, error) {
+	return p.GetIPList()
+}