fix(ios): Fix iOS build with new architecture enabled

[momomuchu]

Fixes issue where iOS build fails with "RNTfliteSpec.h file not found" when React Native new architecture (TurboModules) is enabled.

Changes:

1. Podspec: Merge pod_target_xcconfig instead of overwriting to preserve TensorFlow Lite settings when new architecture is enabled
2. Podspec: Add RCT-RCTFabric dependency for Fabric support
3. Podspec: Remove duplicate CLANG_CXX_LANGUAGE_STANDARD entries
4. iOS: Update RNTfliteSpec.h import to use correct path format (<RNTfliteSpec/RNTfliteSpec.h> instead of "RNTfliteSpec.h")

The issue was caused by:

• pod_target_xcconfig being redefined instead of merged, losing TensorFlow Lite preprocessor definitions
• Incorrect header import path for Codegen-generated spec file

Resolves: #87

[momomuchu]

ref issue: #87

[efstathiosntonas]

I think you should also add this:

node_modules/react-native-fast-tflite/ios/Tflite.mm (+1 -1)
    57  {
    58 -    return std::make_shared<facebook::react::NativeTfliteSpecJSI>(params);
    58 +    return std::make_shared<facebook::react::NativeRNTfliteSpecJSI>(params);
    59  }

The TurboModule export now returns facebook::react::NativeRNTfliteSpecJSI, matching the actual JSI class generated in RNTfliteSpec. This resolves the “No member named NativeTfliteSpecJSI” error.

[mrousavy]

Hi - thanks for the PR - we recently migrated the library to Nitro and upgraded it to latest LiteRT, so I think this PR is quite out of sync now - sorry for not getting it merged sooner.

I'm going to close this for now, but if this is still relevant in the latest version, we can open another PR and get it merged. 👍