docs/design/server_contracts/ lands the contract reference set that PR
8 locks down ahead of the streaming + Dynamo upstreams. This commit
adds the index page plus the OpenAI HTTP reference:
* endpoint catalogue (/v1/videos/generations, list, status, content,
images, models, health)
* VideoGenerationsRequest shape with SGLang-compatible extensions
* merge precedence (body > default_request > hardcoded fallback)
with a pointer to the explicit-path tracking mechanism that makes
it work
* continuation-state roundtrip on the stateless surface
* HTTP error code table
* explicit non-goals: flat legacy kwargs, private Dreamverse fields,
raw tensor payloads — all excluded from this boundary by design
Co-authored-by: Junda (David) Su <90978028+Davids048@users.noreply.github.com>
Co-authored-by: Matthew Noto <99706358+RandNMR73@users.noreply.github.com>
Co-authored-by: XOR-op <17672363+XOR-op@users.noreply.github.com>
Co-authored-by: Zhang Peiyuan <42993249+jzhang38@users.noreply.github.com>
