Replace the claim's per-claim Nango list. Admin only.

Each entry must be a Nango-migrated provider the claim type supports (400 otherwise). Providers already on globally via NANGO_PROVIDERS may be listed too (harmless — the OR keeps them on) but need not be. Idempotent: an unchanged list writes nothing and no audit entry.

Turning a provider ON: new connects on this claim mint a Nango Connect session, and rows this claim links that already carry a nango_connection_id (imported with nango_import_connections.py --claim or bound via the Connect UI) refresh through Nango from the next token fetch. Turning it OFF: new connects fall back to the legacy popup; rows already bound to Nango are NOT moved back (see connections in the response for how many there are).