feat(api): update API spec from langfuse/langfuse 446fe55 #6393

Job	Run time
Unit tests on Python 3.10	20s
E2E shard 1 tests on Python 3.13	2m 7s
Unit tests on Python 3.12	18s
E2E shard 2 tests on Python 3.13	2m 54s
E2E live-provider tests on Python 3.13	1m 59s
linting	11s
Unit tests on Python 3.11	18s
Unit tests on Python 3.14	20s
type-checking	18s
Unit tests on Python 3.13	20s
all-tests-passed	4s
	9m 9s

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