Pictures are priced by the picture

auth.pricing takes per_image, charged on top of a prompt's tokens; a model
priced only per picture is not free, so a spent budget still stops it.
Each usage row keeps how many pictures were made (migration 0041), and
ctl request and the admin API's request view show them.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/admin-api.openapi.json

@@ -7595,6 +7595,10 @@
             "type": "integer",
             "format": "int64"
           },
+          "images": {
+            "type": "integer",
+            "format": "int64"
+          },
           "cost_micros": {
             "type": "integer",
             "format": "int64"