fix(compilation): resolve type system and interface errors

- Add GetPoolsByToken method to cache interface and implementation
- Fix interface pointer types (use interface not *interface)
- Fix SwapEvent.TokenIn/TokenOut usage to use GetInputToken/GetOutputToken methods
- Fix ethereum.CallMsg import and usage
- Fix parser factory and validator initialization in main.go
- Remove unused variables and imports

WIP: Still fixing main.go config struct field mismatches

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

pkg/execution/risk_manager.go

@@ -8,8 +8,8 @@ import (
 	"sync"
 	"time"
 
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/ethclient"
 
 	"github.com/your-org/mev-bot/pkg/arbitrage"
@@ -254,7 +254,7 @@ func (rm *RiskManager) SimulateExecution(
 	defer cancel()
 
 	// Create call message
-	msg := types.CallMsg{
+	msg := ethereum.CallMsg{
 		To:       &tx.To,
 		Gas:      tx.GasLimit,
 		GasPrice: tx.MaxFeePerGas,