Expose config options for cleartext stratum port

LICENSE

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+Kamado Pool
+Copyright (C) 2026 Kamado Pool contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+---
+
+This project is built on top of CKPool by Con Kolivas, which is itself
+licensed under GPL-3.0. See https://bitbucket.org/ckolivas/ckpool for
+the upstream source. The full GPL-3.0 text is available at:
+https://www.gnu.org/licenses/gpl-3.0.txt