Add serverless usc1 hostnames to SDK hosted-API URL list

[ecarrara]

What does this PR do?

Adds https://serverless.usc1.roboflow.com and https://serverless.usc1.roboflow.one to ALL_ROBOFLOW_API_URLS in inference_sdk/config.py.

InferenceHTTPClient selects API v0 (hosted platform protocol) only for URLs in this list; any other URL is treated as a self-hosted server (v1), where the SDK manages models via GET /model/registry + POST /model/add. The serverless deployments do not expose /model/add — the request falls into the legacy /{dataset_id}/{version_id} route, which interprets model/add as a model ID and fails with a 403 RoboflowAPIForbiddenError.

Related Issue(s): —

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

• I have tested this change locally
• I have added/updated tests for this change

Test details:
Verified _determine_client_mode resolves the new hostnames to v0 and that unrelated URLs still resolve to v1. Reproduced the original failure against the new staging deployment (serverless.usc1.roboflow.one): v1 mode fails on POST /model/add with 403, while v0 mode (client.select_api_v0()) works end to end.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

Additional Context

Until this ships in a release, the workaround for SDK users on the usc1 hostnames is InferenceHTTPClient(...).select_api_v0().