* feat(ui): configure Anthropic workload identity federation from the dashboard
Add Credential and Edit Credential offer workload identity federation for Anthropic, Add Model creates a federated credential and attaches it, and the credentials table marks federated credentials. Editing a credential now sends only the values the admin changed, and switching provider no longer leaves the previous provider's default base URL on screen
* fix(ui): keep a credential edit to what the admin set in the federation form
* fix(ui): lock the provider in the federation dialog opened from Add Model
* fix(ui): require one federation id when the identity source is the proxy environment
* test(credentials): cover the Anthropic federation dashboard and credential routes
Integration cells for the credential routes every dashboard shape writes (round trips, PATCH set and delete, malformed bodies, non-admin refusals, the token-file allowlist and exchange-host checks, every identity source through chat and messages against a scripted exchange, concurrent writes across two workers and a worker kill mid burst), plus Playwright specs for the Add Credential, Edit Credential and Add Model federation flows and the team-admin view. The owned proxies boot with a 2 s config reload so both workers serve a stored credential inside the fixture budget.
* test(e2e): type the federation spec's captured bodies and clean up the Add Model deployment by its created id
captureRequestBody and postAsMaster take a type parameter instead of returning Record<string, any>, the spec names the credential and model write shapes it captures, and the Add Model cell reads the deployment id from the /model/new response right after the click so a later failing check no longer leaves the deployment behind.
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Co-authored-by: mateo-berri <277851410+mateo-berri@users.noreply.github.com>
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