v0.1.0-U (vc=8): Phase U-1 + U-2 — Rust core + rustypipe search

NewPipeExtractor (Java) → strawcore (Rust) migration begins. Phase U:
- U-1: Rust toolchain + UniFFI smoke test
- U-2: rustypipe search via uniffi suspend fun, SearchViewModel swapped

What landed:
- rust/strawcore — UniFFI-exported Rust crate using proc-macros.
  Builds for arm64-v8a + armeabi-v7a + x86 + x86_64 via cargo-ndk.
  Tokio multi-thread runtime singleton drives rustypipe's async API.
- strawApp/build.gradle.kts — cargoBuildHost + cargoBuild + uniffiBindgen
  Gradle Exec tasks chained into the Android build. Generated Kotlin
  bindings land in src/main/java/uniffi/strawcore/ (gitignored).
- SearchViewModel.kt — calls uniffi.strawcore.search(query) directly.
  NewPipeExtractor still in deps for VideoDetail/Player/Channel paths;
  those move to Rust in U-3 / U-4.
- Build chain quirks beat:
  * cargo absolute path in Exec tasks (PATH wasn't propagating)
  * uniffi-bindgen needs UNSTRIPPED host .so — separate cargoBuildHost
    builds a debug-profile host lib to read metadata from
  * rustypipe rustls-tls-webpki-roots avoids the openssl-sys
    cross-compile tarpit
  * rquickjs-sys 'bindgen' feature opted in (no prebuilt Android
    bindings ship; crafting-table has libclang 14)
- crafting-table runtime install (until Dockerfile catches up):
  rustup + 4 Android targets + cargo-ndk + NDK r27c. Persists in
  /caches/cargo + /caches/android-sdk via the volume mount.

APK size: 22MB (U-1) → 37MB (U-2). libstrawcore.so 3-5MB per ABI carries
rustypipe + reqwest + tokio + rustls + rquickjs. NewPipeExtractor still
in for now (still drives detail + player + channel + feed), so the
Java half is doubled up. U-5 removes it.

rust/Cargo.toml

@@ -0,0 +1,30 @@
+# Straw Rust core — workspace.
+# Hosts the JNI/UniFFI-exported library that replaces NewPipeExtractor.
+#
+# Builds via cargo-ndk for the four Android ABIs (arm64-v8a, armeabi-v7a,
+# x86, x86_64). The Mozilla rust-android-gradle plugin wires this into the
+# strawApp Gradle build so `./gradlew assembleDebug` produces a single APK
+# with the .so files packed inside.
+
+[workspace]
+resolver = "2"
+members = ["strawcore"]
+
+[workspace.package]
+edition = "2021"
+license = "GPL-3.0-or-later"
+authors = ["Sulkta-Coop"]
+repository = "http://192.168.0.5:3001/Sulkta-Coop/straw"
+
+[profile.release]
+# Strip debug info, run thin LTO. APK size matters more than build time here.
+strip = true
+lto = "thin"
+codegen-units = 1
+panic = "abort"
+opt-level = "z"
+
+[profile.dev]
+# Keep debug builds fast — we're rebuilding constantly during U-1..U-5.
+opt-level = 0
+debug = 1