Release v0.6.2

• Migrate JNI FFI bindings to jni 0.22, updating JNIEnv to EnvUnowned
• Resolve compilation warnings regarding unused imports, unnecessary mutable variables, and dead code
• Replace deprecated set_object_array_element with JObjectArray::set_element
• Remove unused GLOBAL_STATS and RUNTIME statics
• Ensure clean compile across all features
• Migrate all JNI exported fns to EnvUnowned<'local> + with_env pattern
• Restore accidentally deleted GLOBAL_STATS, RUNTIME, entry_count()
• fix find_class() to use jni_str!() macro
• fix get_string() -> JString::try_to_string()
• fix set_int_array_region() -> JIntArray::set_region()
• fix jboolean: jni 0.22 uses bool not u8
• fix init_hosted -> init_with_env (rustls-platform-verifier 0.7 rename)
• fix getLogs() return type nullable to handle empty queue (null from JNI)
• null-coalesce getLogs() call site to prevent NPE in LogScreen
• fix: always poll getStats() regardless of VPN active state
  Full Changelog: v0.6.1...v0.6.2