refactor: use built-in bootimg crate, remove magiskboot (WIP)

[YuKongA]

• based on main...5ec1cff:KernelSU:bootimg
• missing dc1f174a

[Copilot]

Pull request overview

This PR refactors KernelSU’s userspace boot image patch/restore flow to use the android-bootimg Rust crate instead of relying on magiskboot, and removes the now-unneeded magiskboot plumbing from the CLI, installer, and Manager command invocations.

Changes:

• Replace magiskboot subprocess usage in boot_patch with in-process parsing/patching via android-bootimg + cpio edits.
• Remove --magiskboot options/paths from ksud install/uninstall commands and Manager-side command construction.
• Add new Rust dependencies to support the refactor (bootimg crate, memmap, SHA1 hex encoding helpers) and update the lockfile accordingly.

Reviewed changes

Copilot reviewed 8 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
userspace/ksud/src/utils.rs	Drops magiskboot installation/uninstall wiring and calls restore without magiskboot.
userspace/ksud/src/late_load.rs	Updates call site for the new utils::install() signature.
userspace/ksud/src/defs.rs	Removes the MAGISKBOOT_PATH constant.
userspace/ksud/src/cli.rs	Removes --magiskboot CLI options and updates install/uninstall dispatch.
userspace/ksud/src/boot_patch.rs	Reimplements boot patch/restore using android-bootimg + CPIO manipulation; adds direct partition flashing.
userspace/ksud/src/assets.rs	Replaces file-copy helper with an in-memory asset accessor used by the new patcher flow.
userspace/ksud/Cargo.toml	Adds android-bootimg, memmap2, base16ct, bumps sha1, updates bindgen.
manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt	Removes --magiskboot usage from Manager ksud command invocations.
Cargo.lock	Updates lockfile for new/updated dependencies.

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