Add SGLang Router Support #5845

Job	Run time
compute-version	2s
build-docs	0s
build-artifacts / code-lint	42s
build-artifacts / frontend-build	11s
build-artifacts / gateway-build	13s
build-artifacts / runner-test (macos-latest)	1m 1s
build-artifacts / runner-test (ubuntu-latest)	55s
build-artifacts / generate-json-schema	0s
build-artifacts / python-build	0s
build-artifacts / python-test	0s
build-artifacts / runner-compile (ubuntu-24.04-arm, linux, arm64)	28s
build-artifacts / runner-compile (ubuntu-24.04, linux, amd64)	40s
upload-post-pypi-artifacts	0s
upload-pre-pypi-artifacts	0s
	4m 12s

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