refactor: finish whitelist-to-allowlist rename in imgcache

internal/imgcache/service.go

@@ -40,8 +40,8 @@ type ServiceConfig struct {
 	Fetcher httpfetcher.Fetcher
 	// SigningKey is the HMAC signing key (empty disables signing)
 	SigningKey string
-	// Whitelist is the list of hosts that don't require signatures
-	Whitelist []string
+	// Allowlist is the list of hosts that don't require signatures
+	Allowlist []string
 	// Logger for logging
 	Logger *slog.Logger
 }
@@ -89,7 +89,7 @@ func NewService(cfg *ServiceConfig) (*Service, error) {
 		fetcher:         fetcher,
 		processor:       imageprocessor.New(imageprocessor.Params{MaxInputBytes: maxResponseSize}),
 		signer:          signer,
-		allowlist:       allowlist.New(cfg.Whitelist),
+		allowlist:       allowlist.New(cfg.Allowlist),
 		log:             log,
 		allowHTTP:       allowHTTP,
 		maxResponseSize: maxResponseSize,