Earnings Contract (contracts/earnings/src/lib.rs)

Admin-tracked earnings totals.

Methods

Method	Args	Returns	Auth	Example Invoke	Expected Events
`init`	`admin: Address`	`()`	admin	`soroban contract invoke ... init -- ADMIN`	None
`admin`	`()`	`Address`	none	`soroban contract invoke ... admin`	None
`record`	`creator: Address, amount: i128`	`()`	admin	`soroban contract invoke ... record -- CREATOR 1000`	None
`get_earnings`	`creator: Address`	`i128`	none	`soroban contract invoke ... get_earnings -- CREATOR`	None
`withdraw`	`creator: Address, amount: i128`	`()`	creator	`soroban contract invoke ... withdraw -- CREATOR 500`	`("withdrawn", creator) -> amount`

Admin records per-creator earnings totals. Simple accumulator.