chore(openapi): regenerate snapshot for tips_amount_usd

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: enriquephl

crates/eros-engine-server/openapi.json

@@ -1749,6 +1749,13 @@
               "string",
               "null"
             ]
+          },
+          "tips_amount_usd": {
+            "type": [
+              "number",
+              "null"
+            ],
+            "format": "double"
           }
         }
       },