feat(android): implement private Rust storage runtime (#90)

Cargo.toml

@@ -30,6 +30,7 @@ arboard = { version = "3.6", default-features = false, features = ["wayland-data
 ashpd = { version = "0.13", default-features = false, features = ["file_chooser", "tokio"] }
 cap-std = "4.0"
 cap-tempfile = "4.0"
+rustix = { version = "1.1", features = ["fs"] }
 clap = { version = "4.6", features = ["derive"] }
 clap_complete = "4.6"
 crossterm = "0.29"