* feat(teams): apply default organization to new teams from default team settings
Adds organization_id to DefaultTeamSSOParams so proxy admins can pick a
default organization in Default Team Settings. new_team applies it before
org validation whenever a team is created without an explicit
organization_id, so API, Admin UI, SCIM, SSO, and team upsert creations
all inherit it and go through the same existence and org-limit checks.
Explicit organization selections win and existing teams are untouched.
The default is validated at save time (PATCH /update/default_team_settings
returns 400 for an unknown org) and at create time, where a missing org now
surfaces as a clean 400 instead of a 500 by routing OrganizationNotFoundError
into the previously dead org_table None guard.
The Admin UI Default Team Settings tab gets a Default Organization row
backed by the shared OrganizationDropdown.
* fix(teams): validate org limits against final team state including defaults
Applies default_team_params and the legacy max_budget fallback before the
organization validation block, so _check_org_team_limits sees the values the
team will actually be persisted with. Also loads the org's budget table in
the lookup; without include_budget_table every budget comparison in
_check_org_team_limits was skipped because litellm_budget_table was None.
* test(proxy_behavior): pin org team limits as enforced on /team/new
The dead-code pins existed to turn red when include_budget_table went
live; that happened, so the scenarios now assert the 400 rejections plus
within-cap acceptance, and the unknown-org pin asserts the handler's 400
instead of the surfaced 500.
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