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

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

pkg/cache/interface.go

@@ -24,6 +24,9 @@ type PoolCache interface {
 	// GetByLiquidity retrieves pools sorted by liquidity (descending)
 	GetByLiquidity(ctx context.Context, minLiquidity *big.Int, limit int) ([]*types.PoolInfo, error)
 
+	// GetPoolsByToken retrieves all pools containing a specific token
+	GetPoolsByToken(ctx context.Context, token common.Address) ([]*types.PoolInfo, error)
+
 	// Add adds or updates a pool in the cache
 	Add(ctx context.Context, pool *types.PoolInfo) error