feat: add iOS Live Photo export native module

AVAssetWriter pipeline generating 3s MOV at 30fps with
Apple content identifier metadata and still-image-time.
HEIC generation with maker note pairing. PHAssetCreation
with photo + pairedVideo resources. CIFilter-based effects
for Ken Burns, Color Shift, Vignette, and Glitch.

modules/livephoto-ios/expo-module.config.json

@@ -0,0 +1,6 @@
+{
+  "platforms": ["ios"],
+  "ios": {
+    "modules": ["LivePhotoModule"]
+  }
+}