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/cache/pool_cache.go

@@ -112,6 +112,21 @@ func (c *poolCache) GetByLiquidity(ctx context.Context, minLiquidity *big.Int, l
 	return pools, nil
 }
 
+// GetPoolsByToken retrieves all pools containing a specific token
+func (c *poolCache) GetPoolsByToken(ctx context.Context, token common.Address) ([]*types.PoolInfo, error) {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+
+	var pools []*types.PoolInfo
+	for _, pool := range c.byAddress {
+		if pool.Token0 == token || pool.Token1 == token {
+			pools = append(pools, pool)
+		}
+	}
+
+	return pools, nil
+}
+
 // Add adds or updates a pool in the cache
 func (c *poolCache) Add(ctx context.Context, pool *types.PoolInfo) error {
 	if pool == nil {