Function normalize_query 

pub fn normalize_query(text: &str) -> String

Normalize text for fuzzy matching: lowercase + strip Polish diacritics.

Maps: ą→a, ć→c, ę→e, ł→l, ń→n, ó→o, ś→s, ź→z, ż→z Enables “wdrozenie” to match “wdrożenie”, “zrodlo” to match “źródło”, etc.