Global search did a single ilike('%CSF Roles%'), so any query with more than one
word required the exact contiguous phrase and usually returned nothing. Add
_word_match: split the query into words and AND them (OR across the searched
columns per word), so 'CSF Roles' matches a record with both words in any field,
any order. Applied across every domain (assets, applications, KB, employees
[selfhosted + external HR], notifications, hostnames, IP, custom fields,
vendor/model/type). External HR path uses a parameterized per-word LIKE.
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