fix: resolve all lint errors, improve type safety, and remove unused code

Remove unused imports, replace `any` types with proper interfaces in directus.ts
and i18n-loader.ts, exclude scripts/ and coverage/ from ESLint, and fix
unused variable warnings across the codebase.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

eslint.config.mjs

@@ -16,6 +16,8 @@ const eslintConfig = [
       ".next/**",
       "out/**",
       "build/**",
+      "coverage/**",
+      "scripts/**",
       "next-env.d.ts",
     ],
   },