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>

app/not-found.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { motion } from "framer-motion";
-import { Home, ArrowLeft, Search, Ghost, RefreshCcw, Terminal } from "lucide-react";
+import { ArrowLeft, Search, Terminal } from "lucide-react";
 import Link from "next/link";
 import { useRouter } from "next/navigation";
 import { useEffect, useState } from "react";