fix(mapper): map Laravel group prefixes

[rohitjavvadi]

Summary

• map literal prefix attributes from array-style Laravel Route::group calls
• apply the group prefix only to routes inside the group closure
• add a mapper regression for /admin/users

Tests

• git diff --check
• corepack pnpm -s format:check
• corepack pnpm -s typecheck
• corepack pnpm -s lint
• corepack pnpm -s exec vitest run src/mapper.test.ts --testNamePattern "maps Laravel array-style route group prefixes"
• corepack pnpm -s test
• corepack pnpm -s build