Add i18next.config.ts to the knip ignore list

frontend/knip.config.ts

@@ -7,7 +7,12 @@ import type { KnipConfig } from "knip";
 
 export default {
   entry: ["src/main.tsx", "src/swagger.ts", "src/routes/*"],
-  ignore: ["src/gql/*", "src/routeTree.gen.ts", ".storybook/locales.ts"],
+  ignore: [
+    "src/gql/*",
+    "src/routeTree.gen.ts",
+    ".storybook/locales.ts",
+    "i18next.config.ts",
+  ],
   ignoreDependencies: [
     // This is used by the tailwind PostCSS plugin, but not detected by knip
     "postcss-nesting",