fix: 🐛 修复 proxy_url SOCKS scheme 验证及 fetch-model 未传递 channel_proxy (#197)

* fix: 🐛 proxy_url 验证增加 socks5 scheme 支持

setting.go 验证白名单只有 socks，但 golang.org/x/net/proxy.FromURL()
只认 socks5，导致 SOCKS 代理无论怎么填都无法使用。
增加 socks5 到验证白名单。

* fix: 🐛 fetch-model 请求传递 channel_proxy 字段

FetchModelRequest 类型缺少 channel_proxy 字段，导致 fetch-model
请求不传该值，后端 ChannelProxy 始终为 nil，即使渠道已配置
channel_proxy 也会回退到系统代理并报 proxy url is empty。

fix #185 fix #186

Author: Moriarty6086

internal/model/setting.go

@@ -64,12 +64,13 @@ func (s *Setting) Validate() error {
 			return fmt.Errorf("proxy URL is invalid: %w", err)
 		}
 		validSchemes := map[string]bool{
-			"http":  true,
-			"https": true,
-			"socks": true,
+			"http":   true,
+			"https":  true,
+			"socks":  true,
+			"socks5": true,
 		}
 		if !validSchemes[parsedURL.Scheme] {
-			return fmt.Errorf("proxy URL scheme must be http, https, or socks")
+			return fmt.Errorf("proxy URL scheme must be http, https, socks, or socks5")
 		}
 		if parsedURL.Host == "" {
 			return fmt.Errorf("proxy URL must have a host")

web/src/api/endpoints/channel.ts

@@ -124,6 +124,7 @@ export type FetchModelRequest = {
     base_urls: BaseUrl[];
     keys: Array<Pick<ChannelKey, 'enabled' | 'channel_key'>>;
     proxy?: boolean;
+    channel_proxy?: string | null;
     match_regex?: string | null;
     custom_header?: CustomHeader[];
 };

web/src/components/modules/channel/Form.tsx

@@ -121,6 +121,7 @@ export function ChannelForm({
                     .filter((k) => k.channel_key.trim())
                     .map((k) => ({ enabled: k.enabled, channel_key: k.channel_key.trim() })),
                 proxy: formData.proxy,
+                channel_proxy: formData.channel_proxy?.trim() || null,
                 match_regex: formData.match_regex.trim() || null,
                 custom_header: formData.custom_header,
             },