Add limited Freebuff DeepSeek access (#657) #681

Job	Run time
build-and-smoke-freebuff-windows	2m 41s
build-freebuff	1m 12s
e2e-startup	1m 1s
e2e-version	55s
e2e-ads-behavior	1m 2s
e2e-code-edit	52s
e2e-agent-startup	2m 28s
e2e-help-command	1m 13s
e2e-terminal-command	59s
e2e-slash-commands	50s
	13m 13s

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