feat: expose liquidity pool stats via GET /sponsors/pool endpoint

[EmeditWeb]

Problem

In sponsors.service.ts (lines 167-190), getPool() reads from the liquidity contract but is NOT exposed as an API endpoint. The pool overview data is computed internally but never returned to clients.

What To Build

1. Add GET /sponsors/pool endpoint
2. Return total_liquidity, share_price, total_shares, active_loans

Files To Touch

• src/modules/sponsors/sponsors.controller.ts
• src/modules/sponsors/sponsors.service.ts

Acceptance Criteria

• GET /sponsors/pool returns pool data
• Build passes

Mandatory Checks

• context/ files read
• npm run build passes
• PR references this issue

[Chigybillionz]

Hi, I’ve reviewed this issue and I’m confident I can fix it. I’d like to take it on.