support drain liquidity when dev rugged 60days project

[koo-virtuals]

Note

High Risk
Introduces new admin/executor-only functions that can drain all pool liquidity and bypass normal withdrawal/maturity constraints, so any role misconfiguration or logic bug could lead to asset loss or abuse.

Overview
Adds privileged liquidity drain paths for rugged Project60days tokens.

FRouterV2 now supports setBondingV2() plus drainPrivatePool() to withdraw all funds from the bonding-curve FPairV2 pool and drainUniV2Pool() to remove all Uniswap V2 liquidity by burning the founder’s veToken balance via AgentFactoryV6.removeLpLiquidity(), with new drain events and token/LP validation gates.

Hardens swap safety by reverting BondingV2/BondingV3/BondingV4 buys/sells when the router returns zero output (preventing post-drain zero-out swaps/forced graduation), and updates FPairV2/IFPairV2 with syncAfterDrain() + Sync event to keep reserves/k consistent after draining; extensive new tests cover drain flows, role gating, and regression scenarios.

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