refactor(i18n): convert config from TypeScript to JavaScript

Converted i18next.config.ts to i18next.config.js and added AGPL license header. The change simplifies the build process by removing TypeScript compilation for this configuration file while maintaining the same functionality.

web/i18next.config.ts → web/i18next.config.js

+/*
+Copyright (C) 2025 QuantumNous
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+For commercial licensing, please contact support@quantumnous.com
+*/
+
 import { defineConfig } from 'i18next-cli';
 
+/** @type {import('i18next-cli').I18nextToolkitConfig} */
 export default defineConfig({
   locales: [
     "zh",