fix: remove unused customEndpointResolver to fix staticcheck lint error

The customEndpointResolver type and its ResolveEndpoint method were
defined but never used, causing staticcheck to fail. Removed the dead
code and associated import.

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

Co-Authored-By: Claude <[email protected]>

Author: corylanou

s3/replica_client.go

@@ -23,7 +23,6 @@ import (
 	"github.com/aws/aws-sdk-go-v2/service/s3"
 	"github.com/aws/aws-sdk-go-v2/service/s3/types"
 	"github.com/aws/smithy-go"
-	smithyendpoints "github.com/aws/smithy-go/endpoints"
 	"github.com/superfly/ltx"
 	"golang.org/x/sync/errgroup"
 
@@ -41,36 +40,6 @@ const DefaultRegion = "us-east-1"
 
 var _ litestream.ReplicaClient = (*ReplicaClient)(nil)
 
-// customEndpointResolver implements the EndpointResolverV2 interface for custom endpoints
-type customEndpointResolver struct {
-	endpoint string
-}
-
-func (r *customEndpointResolver) ResolveEndpoint(ctx context.Context, params s3.EndpointParameters) (smithyendpoints.Endpoint, error) {
-	// For debugging
-	// fmt.Printf("ResolveEndpoint called with bucket: %v\n", aws.ToString(params.Bucket))
-	
-	u, err := url.Parse(r.endpoint)
-	if err != nil {
-		return smithyendpoints.Endpoint{}, fmt.Errorf("invalid endpoint URL: %w", err)
-	}
-	
-	// Create the endpoint with proper settings
-	ep := smithyendpoints.Endpoint{
-		URI:     *u,
-		Headers: http.Header{},
-	}
-	
-	// Set properties based on the endpoint
-	if u.Scheme == "http" {
-		// This tells the SDK to use HTTP instead of HTTPS
-		// For HTTP endpoints, we don't need special properties
-		// The SDK will handle it based on the URI scheme
-	}
-	
-	return ep, nil
-}
-
 // ReplicaClient is a client for writing LTX files to S3.
 type ReplicaClient struct {
 	mu       sync.Mutex
@@ -187,8 +156,6 @@ func (c *ReplicaClient) Init(ctx context.Context) (err error) {
 			if strings.HasPrefix(c.Endpoint, "http://") {
 				o.EndpointOptions.DisableHTTPS = true
 			}
-			// Alternative: Use custom endpoint resolver for more control
-			// o.EndpointResolverV2 = &customEndpointResolver{endpoint: c.Endpoint}
 		})
 	}