feat(claude): add cache_control and speed passthrough controls (#4247)

relay/common/override_test.go

@@ -2038,6 +2038,8 @@ func TestRemoveDisabledFieldsDefaultFiltering(t *testing.T) {
 	input := `{
 		"service_tier":"flex",
 		"inference_geo":"eu",
+		"speed":"fast",
+		"cache_control":{"type":"ephemeral"},
 		"safety_identifier":"user-123",
 		"store":true,
 		"stream_options":{"include_obfuscation":false}
@@ -2048,7 +2050,7 @@ func TestRemoveDisabledFieldsDefaultFiltering(t *testing.T) {
 	if err != nil {
 		t.Fatalf("RemoveDisabledFields returned error: %v", err)
 	}
-	assertJSONEqual(t, `{"store":true}`, string(out))
+	assertJSONEqual(t, `{"cache_control":{"type":"ephemeral"},"store":true}`, string(out))
 }
 
 func TestRemoveDisabledFieldsAllowInferenceGeo(t *testing.T) {
@@ -2067,6 +2069,22 @@ func TestRemoveDisabledFieldsAllowInferenceGeo(t *testing.T) {
 	assertJSONEqual(t, `{"inference_geo":"eu","store":true}`, string(out))
 }
 
+func TestRemoveDisabledFieldsAllowSpeed(t *testing.T) {
+	input := `{
+		"speed":"fast",
+		"store":true
+	}`
+	settings := dto.ChannelOtherSettings{
+		AllowSpeed: true,
+	}
+
+	out, err := RemoveDisabledFields([]byte(input), settings, false)
+	if err != nil {
+		t.Fatalf("RemoveDisabledFields returned error: %v", err)
+	}
+	assertJSONEqual(t, `{"speed":"fast","store":true}`, string(out))
+}
+
 func TestApplyParamOverrideWithRelayInfoRecordsOperationAuditInDebugMode(t *testing.T) {
 	originalDebugEnabled := common2.DebugEnabled
 	common2.DebugEnabled = true