chore(lint): enable strict ESLint rules and fix unused-vars violations (F4.1)

Enable no-console (warn, allow error), @typescript-eslint/no-unused-vars
(warn, ignore _ prefix), and @typescript-eslint/no-explicit-any (warn).
Fix all 26 no-unused-vars violations across 9 files.

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

app/services/modelTypes.ts

@@ -1,5 +1,4 @@
 import { useRequestFetch } from '#imports';
-import type { FetchOptions } from 'ofetch';
 import type {
   ComponentModelStructure,
   PieceModelStructure,