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/api/snippets/route.ts

@@ -12,7 +12,7 @@ export async function GET(request: NextRequest) {
     return NextResponse.json({
       snippets: snippets || []
     });
-  } catch (error) {
+  } catch (_error) {
     return NextResponse.json({ error: 'Failed to fetch snippets' }, { status: 500 });
   }
 }