Greptile P1: the unsafe-method branch of `_check_proxy_admin_viewer_access`
ended with a blanket `if route in management_routes: return`. That set is a
mix of reads (info/list — handled via the safe-method GET branch above) and
writes. The fallback let Admin Viewer POST to write endpoints not enumerated
in `_ADMIN_VIEWER_BLOCKED_WRITE_ROUTES`, including:
- /team/block, /team/unblock, /team/permissions_update
- /jwt/key/mapping/{new,update,delete}
- /key/bulk_update
- /key/{key_id}/reset_spend
Remove the fallback. The two remaining allow sets (admin_viewer_routes and
global_spend_tracking_routes) are both read-only, so removal does not affect
the legitimate POST-as-read cases (e.g. /spend/calculate, which is in
spend_tracking_routes ⊂ admin_viewer_routes).
Tests:
- 8 new parametrized cases pinning each previously-leaking management write
endpoint to 403 on POST for PROXY_ADMIN_VIEW_ONLY.
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