Add DeepSeek V4 model docs #6971

Job	Run time
compute-version	3s
build-docs / build-docs	1m 22s
build-artifacts / gateway-build	11s
build-artifacts / code-lint	50s
build-artifacts / frontend-build	10s
build-artifacts / runner-test (ubuntu-latest)	1m 1s
build-artifacts / runner-test (macos-latest)	50s
build-artifacts / generate-json-schema	16s
build-artifacts / python-build	20s
build-artifacts / python-test (macos-latest, 3.11)	3m 10s
build-artifacts / python-test (windows-latest, 3.10)	2m 11s
build-artifacts / python-test (ubuntu-latest, 3.11)	4m 52s
build-artifacts / python-test (windows-latest, 3.13)	2m 18s
build-artifacts / python-test (macos-latest, 3.10)	2m 27s
build-artifacts / python-test (macos-latest, 3.12)	3m 56s
build-artifacts / python-test (ubuntu-latest, 3.12)	5m 20s
build-artifacts / python-test (ubuntu-latest, 3.10)	5m 14s
build-artifacts / python-test (ubuntu-latest, 3.13)	5m 0s
build-artifacts / python-test (windows-latest, 3.11)	2m 27s
build-artifacts / python-test (macos-latest, 3.13)	2m 32s
build-artifacts / python-test (windows-latest, 3.12)	2m 8s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	33s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	33s
upload-post-pypi-artifacts / upload-post-pypi-artifacts	16s
upload-pre-pypi-artifacts / upload-pre-pypi-artifacts	18s
	48m 18s

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