[FEATURE] Use path parameter `account_address` in `/position/{account_address}/force_unlock` API

[purplesmoke05]

Is your feature request related to a problem? Please describe.

• In POST: /position/{account_address}/force_unlock, {account_address} exists as a path parameter, but the account_address of the request body is used in the logic.

https://github.com/BoostryJP/ibet-Prime/blob/9be57a10e79ad88ce76f549712644236713e3d03/app/routers/position.py#L424-L444

Describe the solution you'd like

• Use path parameter account_address in /position/{account_address}/force_unlock API.