v0.1.0-W (vc=10): U-4 + U-5 — channels via rustypipe + rip NewPipeExtractor

channel_info(url) UniFFI suspend fn. ChannelViewModel +
SubscriptionFeedViewModel both swap. NewPipeExtractor (Java) is OUT —
zero org.schabi.newpipe classes in the APK now.

Cleanup:
- NewPipeDownloader.kt deleted (was the OkHttp adapter)
- Thumbnails.kt deleted (rustypipe returns full URLs)
- NewPipe.init() dropped from StrawApp.onCreate
- libs.newpipe.extractor removed from build.gradle.kts
- STRAW_USER_AGENT + strawHttpClient() now live in net/Http.kt
- RydClient + SponsorBlockClient + PlayerScreen + PlaybackService all
  read from net/Http.kt instead of the extractor package

rustypipe API quirks beat:
- channel_videos(id) is the right method (channel() doesn't exist)
- ChannelInfo struct = basic metadata; Channel<T> wrapper carries
  name/avatar/banner + .content is the paginator of videos
- description is String (not Option), subscriber_count is Option<u64>

End state: strawApp Kotlin is ~UI + thin glue to strawcore. The Rust
core handles search / streamInfo / channel / channel_videos via UniFFI
suspend fns. Tokio + reqwest + rustls + rquickjs all packed in
libstrawcore.so (~6MB per ABI). APK 40MB total.

buildSrc/src/main/kotlin/ProjectConfig.kt

@@ -15,6 +15,6 @@ const val NEWPIPE_APPLICATION_ID_OLD = "org.schabi.newpipe"
 const val NEWPIPE_APPLICATION_ID_NEW = "net.newpipe.app"
 
 // Sulkta fork — Straw
-const val STRAW_VERSION_CODE = 9
-const val STRAW_VERSION_NAME = "0.1.0-V"
+const val STRAW_VERSION_CODE = 10
+const val STRAW_VERSION_NAME = "0.1.0-W"
 const val STRAW_APPLICATION_ID = "com.sulkta.straw"