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/executor.go

@@ -232,7 +232,7 @@ func (e *Executor) Execute(ctx context.Context, opp *arbitrage.Opportunity) (*Ex
 
 	// Calculate actual profit
 	actualProfit := e.calculateActualProfit(receipt, opp)
-	gasCost := new(big.Int).Mul(receipt.GasUsed, receipt.EffectiveGasPrice)
+	gasCost := new(big.Int).Mul(big.NewInt(int64(receipt.GasUsed)), receipt.EffectiveGasPrice)
 
 	result := &ExecutionResult{
 		Success:      receipt.Status == types.ReceiptStatusSuccessful,

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,