Add lowercase proxy environment variables for compatibility

- Set both HTTP_PROXY/http_proxy and HTTPS_PROXY/https_proxy
- Ensures curl and other tools properly use the proxy
- Now properly blocks traffic as expected in unprivileged mode

Co-authored-by: f0ssel <[email protected]>

Author: blink-so[bot]

namespace/unprivileged.go

@@ -34,6 +34,8 @@ func (u *Unprivileged) Start() error {
 	u.commandEnv = mergeEnvs(e, map[string]string{
 		"HTTP_PROXY":  fmt.Sprintf("http://127.0.0.1:%d", u.httpProxyPort),
 		"HTTPS_PROXY": fmt.Sprintf("https://127.0.0.1:%d", u.httpsProxyPort),
+		"http_proxy":  fmt.Sprintf("http://127.0.0.1:%d", u.httpProxyPort),
+		"https_proxy": fmt.Sprintf("https://127.0.0.1:%d", u.httpsProxyPort),
 	})
 	return nil
 }