fix: resolve lint and typecheck errors in API routes and tests

- Remove unused imports (users, and) from api-tokens model
- Fix password_hash destructure lint error in user routes
- Fix apiErrorResponse mock pattern in all 12 test files (use instanceof)
- Remove stale eslint-disable directives from test files
- Add eslint override for tests (no-explicit-any, no-require-imports)
- Fix unused vars in settings and tokens tests
- Fix unused tokenB in integration test

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

eslint.config.mjs

@@ -19,4 +19,11 @@ export default [
       '@next/next/no-img-element': 'off',
     },
   },
+  {
+    files: ['tests/**/*.{ts,tsx}'],
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-require-imports': 'off',
+    },
+  },
 ];