fix(api-docs): fix YieldGenReportResponse format

[theborakompanioni]

API docs state wrong return type for /wallet/yieldgen/report.

Instead of an array, the response contains an object with property yigen_data:

https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/ce32bafbb5d716bde61830f71266410249d43dbc/src/jmclient/wallet_rpc.py#L974C53-L974C63

[Copilot]

Pull request overview

This PR corrects the OpenAPI schema for /wallet/yieldgen/report so the documented response matches the actual RPC output (an object containing yigen_data, rather than a bare array).

Changes:

• Update YieldGenReportResponse from array[string] to an object with a yigen_data: array[string] property.

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[Copilot]

The /wallet/yieldgen/report endpoint description earlier in this spec still says the response is “Data returned as list of strings…”, but the schema was updated to an object wrapper with yigen_data. To keep the OpenAPI docs consistent, update that endpoint description to mention the yigen_data property (and that it contains the list of CSV-formatted strings).

Suggested change

	type: object
	properties:
	yigen_data:
	type: array
	type: object
	description: Object wrapper containing yield generator report data in the `yigen_data` property.
	properties:
	yigen_data:
	type: array
	description: List of CSV-formatted strings, each representing a yield generator report row.