* feat(cli): detect Android env and install SDK and NDK if needed
changes the Android setup to be a bit more automated - looking up ANDROID_HOME and NDK_HOME from common system paths and installing the Android SDK and NDK if needed using the command line tools
* fix windows
* clippy
* lint
* add prmopts and ci check
* also check ANDROID_SDK_ROOT
* feat(cli): enhance iOS bundle version formatting
follow-up for #13030 and https://github.com/tauri-apps/cargo-mobile2/pull/450
the bundle version validation has been updated, now it can actually handle one or two integers (e.g. `100` or `10.7`) instead of just full triple semver strings (e.g. `10.7.1`).
* lint
* Fix mixup of `env_tauri_app_path()` and `env_tauri_frontend_path()` in tauri's path resolutions
* Rename functions in `app_paths` to match their corresponding, publicly exposed env var keys
* Rename `app_dir`/`app_path` variables that deal with the frontend app's directory to `frontend_dir
* Rename `APP_DIR` to `FRONTEND_DIR`
* Improve comment on meaning of tauri path env vars
