feat: add Grok 4.5 model support and fix xAI reasoning format #3001

Job	Run time
check-translations	33s
knip	54s
platform-unit-test (ubuntu-latest)	5m 30s
dependency-review	10s
compile	2m 17s
platform-unit-test (windows-latest)	13m 9s
invisible-chars	7s
	22m 40s

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