docs: Add complete contract documentation for V2, infrastructure, launchpad and bridge (JuiceDollar#28)

- Add Uniswap V2 contracts (Factory, Router) for both mainnet and testnet
- Add V3 infrastructure contracts (QuoterV2, TickLens, V3Migrator, V3Staker, Multicall2, ProxyAdmin)
- Add NFT descriptor contracts (NFTDescriptorLibrary, PositionDescriptor, DescriptorProxy)
- Add Launchpad contracts (TokenFactory, BondingCurveToken)
- Add LayerZero bridge contracts (USDC, USDT, WBTC.e and OFT adapters) for mainnet
- Update contract summary tables with complete addresses
- Update source code section with all repositories

Author: TaprootFreak