[codex] Add Moonshot Kimi backend provider (#639) #6548

Job	Run time
build-and-check	3m 6s
test-integration-packages/internal	1m 11s
test-integration-packages/billing	1m 12s
test-integration-sdk	1m 12s
test-integration-web	52s
test-integration-packages/agent-runtime	39s
test-integration-common	43s
test-integration-cli	41s
test-packages/billing	46s
test-packages/internal	45s
test-.agents	50s
test-common	43s
test-packages/agent-runtime	41s
test-sdk	52s
test-cli	1m 1s
test-web	1m 35s
	16m 49s

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