Fix contract flaws (LP trap / msg.sender + oracle mismatch)

[0xJonHoldsCrypto]

Fixed issues with msg.sender implementation crediting the proxy contract with the LP deposit resulting in an LP trap. Also, the oracle was referencing the quote token in the improper order A/B - fixed for B/A to match Uniswap method.

[Copilot]

Pull request overview

This PR fixes two critical contract flaws: (1) an LP trap issue where liquidity providers' shares were incorrectly credited to the router contract instead of the user, and (2) an oracle price calculation error where the token ratio was inverted (A/B instead of B/A) in the Uniswap V3 TWAP adapter.

Key changes:

• Added receiver parameter to addLiquidity function to enable explicit control over LP share ownership
• Refactored oracle price calculation logic to properly handle token ordering and price inversion
• Updated interface definitions to maintain consistency across contracts

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
contracts/FpmmAMM.sol	Added receiver parameter to addLiquidity function and updated LP share crediting logic to use receiver instead of msg.sender
contracts/SimpleRouter.sol	Updated addLiquidity call to pass msg.sender as receiver parameter, ensuring LP shares go to the user instead of the router
contracts/UniV3EthUsdTwapOracleAdapter.sol	Rewrote price calculation logic to correctly handle token0/token1 ordering and properly compute price ratios with decimal adjustments

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.