Restore Gemini thinker for Kimi freebuff #6342

Job	Run time
build-and-check	2m 57s
test-integration-packages/billing	1m 7s
test-integration-packages/internal	1m 5s
test-integration-packages/agent-runtime	52s
test-integration-cli	42s
test-integration-common	42s
test-integration-web	46s
test-integration-sdk	1m 18s
test-packages/agent-runtime	53s
test-cli	55s
test-.agents	44s
test-packages/internal	52s
test-common	50s
test-packages/billing	43s
test-web	1m 8s
test-sdk	46s
	16m 20s

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