app: support download image and patch

[vvb2060]

No description provided.

[Copilot]

Pull Request Overview

This PR adds support for downloading and patching images directly from URLs to Magisk, expanding installation options beyond local files. It also includes a complete rewrite of the payload processing logic using Java Channel APIs and protobuf support.

Key changes:

• New download functionality with URL-based image patching
• Complete rewrite of payload processing using protobuf
• Added Java Channel-based data source implementation for efficient file/network operations

Reviewed Changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
app/gradle/libs.versions.toml	Added protobuf and XZ compression dependencies
app/core/src/main/res/values/strings.xml	Added UI strings for download functionality
app/core/src/main/proto/update_metadata.proto	Added protobuf definitions for OTA payload parsing
app/core/src/main/java/com/topjohnwu/magisk/core/utils/DataSourceChannel.java	New efficient data source abstraction for files and HTTP
app/core/src/main/java/com/topjohnwu/magisk/core/tasks/Payload.kt	New payload processing implementation using protobuf
app/core/src/main/java/com/topjohnwu/magisk/core/tasks/ExtractImage.kt	New image extraction logic for factory images and OTA packages
app/core/src/main/java/com/topjohnwu/magisk/core/tasks/MagiskInstaller.kt	Updated installer with download support and simplified processing
app/apk/src/main/java/com/topjohnwu/magisk/dialog/DownloadDialog.kt	New dialog for URL input validation
UI layouts	Updated to support download option and fix console display issues

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Using the dialog title string as an error message is confusing and unhelpful. The error should use a descriptive message like 'Invalid URL format' or create a dedicated error string resource.

Suggested change

	editText.error = context.getString(R.string.download_dialog_title)
	editText.error = context.getString(R.string.download_dialog_invalid_url)