CLI: configurable Android versionCode and iOS/macOS CFBundleVersion

[nicoburns]

Summary

Supersedes/extends #5525. The generated Android Gradle project pins versionCode = 1, which makes Play Store uploads impossible after the first one, and iOS/macOS have no way to set CFBundleVersion (the App Store build number) independently of the crate version. This adds explicit config + per-build overrides, with a semver-derived fallback (matching Tauri v2's default behavior):

Android versionCode — resolution order:

1. --version-code <u32> / DX_ANDROID_VERSION_CODE env var
2. [android] version_code in Dioxus.toml
3. derived from the crate version: major * 1_000_000 + minor * 1_000 + patch (errors if major > 2099 || minor > 999 || patch > 999; warns if a pre-release identifier is being dropped; 0.0.0 is bumped to 1)

The resolved value is validated against Play's 1..=2_100_000_000 range (BuildRequest::android_version_code() -> Result<u32>).

iOS/macOS CFBundleVersion — resolution order:

1. --bundle-version <string> / DX_BUNDLE_VERSION env var
2. [ios] bundle_version (new) or [macos] bundle_version (already existed in the config, now also honored by the dev-loop plist path) in Dioxus.toml
3. crate version (previous behavior)

Wired through BuildRequest::apple_bundle_version() into ios.plist.hbs / mac.plist.hbs, and into the macOS bundler's plist generation (where the legacy [bundle.macos] bundle_version is kept as a fallback).

CFBundleShortVersionString and Android versionName still come from the crate version, unchanged.

Also enables clap's env feature for the CLI and regenerates schema.json.

Follow-up worth considering (not in this PR): Apple rejects non-n.n.n strings for CFBundleShortVersionString, so pre-release crate versions like 1.0.0-alpha should probably be stripped there.

Link to Devin session: https://dioxus.staging.devinenterprise.com/sessions/27c512c36bd94e0e97ea7ef938611aa5
Requested by: @nicoburns

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