Remove stale TurboModule scaffolding from iOS native module (#324)

The #ifdef RCT_NEW_ARCH_ENABLED blocks referenced types
(NativeKlaviyoReactNativeSdkSpec, NativeKlaviyoReactNativeSdkSpecJSI)
that were never implemented — no codegen spec exists. This is the iOS
equivalent of the Android cleanup done in PR #194. The module registers
via RCT_EXPORT_MODULE() and works in bridgeless mode via the interop layer.

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>

Author: ndurell

ios/KlaviyoReactNativeSdk.h

@@ -1,12 +1,6 @@
 
-#ifdef RCT_NEW_ARCH_ENABLED
-#import "RNKlaviyoReactNativeSdkSpec.h"
-
-@interface KlaviyoReactNativeSdk : NSObject <NativeKlaviyoReactNativeSdkSpec>
-#else
 #import <React/RCTBridgeModule.h>
 
 @interface KlaviyoReactNativeSdk : NSObject <RCTBridgeModule>
-#endif
 
 @end

ios/KlaviyoReactNativeSdk.mm

@@ -142,13 +142,4 @@ - (NSDictionary *)constantsToExport {
     });
 }
 
-// Don't compile this code when we build for the old architecture.
-#ifdef RCT_NEW_ARCH_ENABLED
-- (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:
-(const facebook::react::ObjCTurboModule::InitParams &)params
-{
-    return std::make_shared<facebook::react::NativeKlaviyoReactNativeSdkSpecJSI>(params);
-}
-#endif
-
 @end