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/arbitrage/detector.go

@@ -56,7 +56,7 @@ type Detector struct {
 	config       *DetectorConfig
 	pathFinder   *PathFinder
 	calculator   *Calculator
-	poolCache    *cache.PoolCache
+	poolCache    cache.PoolCache
 	logger       *slog.Logger
 
 	// Statistics
@@ -72,7 +72,7 @@ func NewDetector(
 	config *DetectorConfig,
 	pathFinder *PathFinder,
 	calculator *Calculator,
-	poolCache *cache.PoolCache,
+	poolCache cache.PoolCache,
 	logger *slog.Logger,
 ) *Detector {
 	if config == nil {
@@ -153,7 +153,9 @@ func (d *Detector) DetectOpportunitiesForSwap(ctx context.Context, swapEvent *me
 	)
 
 	// Get affected tokens
-	tokens := []common.Address{swapEvent.TokenIn, swapEvent.TokenOut}
+	tokenIn, _ := swapEvent.GetInputToken()
+	tokenOut, _ := swapEvent.GetOutputToken()
+	tokens := []common.Address{tokenIn, tokenOut}
 
 	allOpportunities := make([]*Opportunity, 0)