Restore Gemini thinker for Kimi freebuff (#577) #6344

Job	Run time
build-and-check	2m 46s
test-integration-packages/internal	1m 15s
test-integration-packages/billing	1m 1s
test-integration-sdk	1m 18s
test-integration-common	45s
test-integration-cli	45s
test-common	42s
test-cli	57s
test-integration-packages/agent-runtime	40s
test-packages/billing	38s
test-packages/internal	54s
test-packages/agent-runtime	51s
test-.agents	40s
test-sdk	52s
test-integration-web	43s
test-web	1m 6s
	15m 53s

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