[JKook-Plus]

Brings the build up to date in one step, because the open Dependabot updates depend on each other: the new androidx libraries (#5) need AGP 9.1 or newer and compileSdk 37, and AGP 9 (#7) needs a newer Gradle. Replaces #5, #6 and #7.

Changes

• Gradle wrapper 8.14.5 to 9.8.1 (wrapper jar matches the published checksum)
• AGP 8.13.2 to 9.4.1. AGP 9 compiles Kotlin itself, so the kotlin-android plugin is removed
• Kotlin 2.2.21 to 2.4.20, coroutines 1.10.2 to 1.11.0
• Compose BOM 2025.12.01 to 2026.09.00, core-ktx 1.17.0 to 1.19.1, exifinterface 1.4.1 to 1.4.2
• compileSdk 36 to 37. targetSdk stays at 34, so runtime behaviour on the phone does not change
• Codec.pickEncoder: videoCapabilities is nullable in SDK 37. A null already ended as "not supported" through runCatching; now it does so without an exception
• Explicit Unit return types on three functions, which Kotlin 2.5 will require
• tasks.register instead of the by registering delegate, which Gradle 10 removes

Testing

• ./gradlew testDebugUnitTest lintDebug assembleDebug assembleRelease: 32 tests pass, lint is clean, and the R8 "error parsing kotlin metadata" warnings that Kotlin 2.4 caused under AGP 8 are gone
• Minified release APK on the API 35 emulator with the virtual UVC camera and USB audio: preview, photo (EXIF intact), a 10 s H.264 + AAC recording, and the web server (page, snapshot, Motion-JPEG, HTTP-FLV, Ogg Opus). No crashes in the log
• Not tested: a real phone or camera, RTSP, live push, FTP and mail upload

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