Add expo-bluesky-video-compress native module

Replaces react-native-compressor's video path with a local Expo module.

Native pipeline:
- iOS: AVAssetReader + AVMutableVideoComposition + AVAssetWriter with
  VideoToolbox encode, BGRA reader for HDR -> SDR conversion, BT.709
  color tagging, DataRateLimits hard cap, AAC re-encode.
- Android: MediaExtractor -> MediaCodec(decoder) -> GL pipeline ->
  MediaCodec(encoder) -> MediaMuxer. BITRATE_MODE_CBR for tight target
  enforcement, GL transform-matrix rotation (no double-rotation),
  raw AAC passthrough, hardware encoder selection with software
  fallback, QTI AVC denylist.

Codec selection: 'auto' resolves to h264 (HLS pipeline + licensing).
HEVC remains opt-in via codec: 'hevc' for future feature-flagged use.

compress.ts adds probe-based smart-skip: clips that are already at or
below 5 Mbps / 1920px / 100MB bypass re-encoding entirely.

react-native-compressor stays as a dep for now since pickVideo and
VideoTranscodeBackdrop still use its non-compression helpers; full
removal is a follow-up.

modules/expo-bluesky-video-compress/android/build.gradle

@@ -0,0 +1,34 @@
+apply plugin: 'com.android.library'
+
+group = 'expo.modules.blueskyvideocompress'
+version = '1.0.0'
+
+def expoModulesCorePlugin = new File(project(":expo-modules-core").projectDir.absolutePath, "ExpoModulesCorePlugin.gradle")
+apply from: expoModulesCorePlugin
+applyKotlinExpoModulesCorePlugin()
+useCoreDependencies()
+useExpoPublishing()
+
+buildscript {
+  ext.safeExtGet = { prop, fallback ->
+    rootProject.ext.has(prop) ? rootProject.ext.get(prop) : fallback
+  }
+}
+
+android {
+  compileSdkVersion safeExtGet("compileSdkVersion", 34)
+
+  namespace "expo.modules.blueskyvideocompress"
+  defaultConfig {
+    minSdkVersion safeExtGet("minSdkVersion", 21)
+    targetSdkVersion safeExtGet("targetSdkVersion", 34)
+    versionCode 1
+    versionName "1.0.0"
+  }
+  lintOptions {
+    abortOnError false
+  }
+}
+
+dependencies {
+}