Add limited Freebuff DeepSeek access #6602

Job	Run time
build-and-check	3m 16s
test-integration-packages/billing	1m 9s
test-integration-packages/internal	1m 4s
test-integration-cli	41s
test-integration-sdk	1m 19s
test-integration-web	40s
test-integration-common	44s
test-integration-packages/agent-runtime	41s
test-cli	1m 15s
test-packages/agent-runtime	44s
test-common	54s
test-sdk	41s
test-.agents	50s
test-packages/internal	57s
test-web	58s
test-packages/billing	43s
	16m 36s

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