feat(uniswap-swaps): trade ERC20/ERC20 pairs instead of ERC20/ETH - #285

Summary

The uniswap-swaps scenario required ~2000 ETH per pool of root-wallet capital because every pair was DAI/WETH. Every pair now trades a per-pair mock DAI token against one shared mock quote token. Both are instances of the existing Dai mock (public mint), so the scenario needs no ETH beyond gas.

• Liquidity is minted, not funded. The v2 PairLiquidityProvider and v3 V3LiquidityProvider mint both tokens on demand and are called by the owner wallet. The root wallet lock and the 2000 ETH per pool are gone. Re-runs skip pairs/pools that already hold reserves.
• Wallets self-fund. Child wallets mint quote tokens to themselves during setup and lazily re-mint when a buy would exceed their balance. New flag --quote-funding (default 5 quote tokens = 50,000 DAI at the seeded price).
• Swap builders simplified. All ETH/WETH branching is removed; v2 and v3 each do a single token-for-token swap. The v3 path derives the required input from the pool spot price and fee, and tracks the guaranteed minimum output instead of a fixed 95% estimate.
• WETH9 is still deployed, but only because the canonical routers take a WETH address in their constructor.

Fixes that fell out

• v2 with --pair-count >= 2 deployed every DAI to the same address (salt written into deployerSeed instead of seed). Both deployment paths now share the corrected logic.
• The rely phase is removed: it could never succeed because only the CREATE2 proxy was a ward, and mint is public anyway.

Behavior notes

• v2 pairs are now seeded with 2000 quote tokens each (v3 pools already had that depth; v2 previously had half).
• Existing deployments get fresh pairs/pools on the next run since the token set changed; factories and routers are reused.
• The daemon preset uniswap-v2-heavy needs no changes.

Test plan

• go fmt, go vet, staticcheck, go test ./... pass
• anvil e2e, v2 with 2 pairs: 9 deploy txs, 2 liquidity txs from owner, 40/40 swaps confirmed, 0 reverts
• anvil e2e, v3 with 2 pairs: 4 pools created/initialized/seeded, 40/40 swaps confirmed, 0 reverts
• anvil v2 re-run: deployment, liquidity and wallet setup all skipped, 10/10 swaps confirmed
• anvil lazy re-mint (tiny --quote-funding, buys only): 19 mints + 21 swaps confirmed, 0 reverts

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