feat(android): implement secure self-hosted companion and release builds

Add native HTTPS onboarding, origin-bound WebView, isolated web authentication, persistent sessions, upload/camera picker, bounded authenticated downloads and recovery. Validate JVM policy tests, debug APK, lint and unsigned release APK/AAB. Build outputs can be relocated for WSL.

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,8 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+distributionSha256Sum=20f1b1176237254a6fc204d8434196fa11a4cfb387567519c61556e8710aed78
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists