Adds siliconflow and siliconflow-cn OpenAI-compatible providers
(api.siliconflow.com / api.siliconflow.cn), with the model list fetched
live from each region's /v1/models endpoint instead of a bundled
catalog (dynamicModelsAuthoritative, no models.dev mapping).
SiliconFlow's /v1/models serves every model type (chat, embedding,
reranker, image, audio, video) with no per-model type field, so
discovery filters non-chat ids out of the picker. The filter was
validated against the live catalog to match the server's own
type=text&sub_type=chat classification exactly (64/64, no false
drops, no false keeps).
Wires SILICONFLOW_API_KEY / SILICONFLOW_CN_API_KEY into env-key
discovery and registers API-key login providers so
`omp login siliconflow` / `omp login siliconflow-cn` stores a
credential validated against each region's /v1/models endpoint.
iacore
dab5934548