refactor: finish whitelist-to-allowlist rename in imgcache

internal/handlers/handlers.go

@@ -84,7 +84,7 @@ func (s *Handlers) initImageService() error {
 		Cache:         cache,
 		FetcherConfig: fetcherCfg,
 		SigningKey:    s.config.SigningKey,
-		Whitelist:     s.config.WhitelistHosts,
+		Allowlist:     s.config.WhitelistHosts,
 		Logger:        s.log,
 	})
 	if err != nil {

internal/handlers/handlers_test.go

@@ -57,7 +57,7 @@ func setupTestHandler(t *testing.T) *testFixtures {
 		Cache:      cache,
 		Fetcher:    newMockFetcher(mockFS),
 		SigningKey: "test-signing-key-must-be-32-chars",
-		Whitelist:  []string{goodHost},
+		Allowlist:  []string{goodHost},
 	})
 	if err != nil {
 		t.Fatalf("failed to create service: %v", err)