v1.0.35

Added full Partner Fee endpoint coverage in v1.0.35 OpenAPI reference:
Create Partner Fee
Update Partner Fee
Delete Partner Fee
Get Partner Fee
List Partner Fees
Added OpenAPI list filtering support for:
fee lookup by external_id
fee list by fee_type
include sub-account fees via include_sub_accounts=true
Updated external_id documentation to require a valid UUID v4 input.
Kept endpoint operation order consistent with Create, Update, Delete, Get, List for Partner Fee navigation and discovery.