[18.0][FIX] base_name_search_improved: restore v16 behavior in _search_smart_search

[lef-adhoc]

In v18 _search_smart_search was delegating to name_search. This introduces an artificial limit (100 records) before other domain filters are applied, leading to incomplete results.

This PR restores the original behavior from v16:

• Build the domain directly in _search_smart_search.

This makes smart search consistent again with standard search and avoids missing records.

[lef-adhoc]

@dreispt @kittiu @Rad0van Hi, could you check this?

[lef-adhoc]

Hi @pedrobaeza, do you happen to know who might see this?

[lef-adhoc]

@dreispt should we merge this PR?