What: plugins/image_gen/openai resolves its endpoint and credential through one
resolver — image_gen.openai.base_url → OPENAI_BASE_URL → SDK default, and the env
var named by image_gen.openai.key_env → OPENAI_API_KEY — shared by is_available()
and generate() so the two cannot disagree. The client is built on
build_keepalive_http_client (env-only proxy policy) and sends a blank
OpenAI-Project header.
Why: the image endpoint could only be routed via the process-wide OPENAI_BASE_URL /
OPENAI_API_KEY, so a local or third-party image gateway could not be configured
independently of the chat provider (#65309, #97928, #13798). openai.OpenAI() with
trust_env routed localhost endpoints through a macOS system proxy whose
ExceptionsList httpx never sees (#64888). An OPENAI_PROJECT_ID set for chat made
/v1/images/generations 403 model_not_found on projects with a model allow-list
even though the key already carries the project (#60748).
Slim redo of the contributor direction in #18796 (@y0shua1ee), #37208/#37209
(@charzhou), #65312/#65323/#64893 (@asdlem), #60749 (@perelin); all predate the
StaticImageGenProvider refactor and no longer apply.
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