refactor: migrate to new arceos branch

[AsakuraMizu]

This PR migrates the arceos submodule to https://github.com/Starry-OS/arceos/tree/dev, which is based on https://github.com/arceos-org/arceos/tree/dev (we will gradually merge the changes upstream).

Thanks to several previous PRs, this PR was completed as smoothly as possible. These PRs include:

• refactor: pin dependencies #49
• refactor: axtask #55
• update arceos #60
• chore: simplify TaskExt usage #63

Changes included in this PR:

• axfs_ng renamed back to axfs
• BACKTRACE build option renamed to DWARF (we'll add a separate BACKTRACE option later to enable simple backtracing without dwarf debugging information support)
• Minor changes to axalloc, axdisplay and axtask api

[Copilot]

Pull request overview

This PR migrates the arceos submodule to a new development branch and updates the codebase to reflect API changes in the new arceos version. The main changes involve renaming axfs_ng back to axfs, updating the BACKTRACE build option to DWARF, and adapting to minor API changes in several modules.

Key changes:

• Module axfs_ng renamed to axfs throughout the codebase
• Build option BACKTRACE renamed to DWARF in Makefile and feature flags
• API updates for axalloc, axdisplay, and axtask modules

Reviewed changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/main.rs	Updates import from axfs_ng to axfs
src/entry.rs	Updates import and removes .unwrap() call on task join
rustfmt.toml	Removes wrap_comments configuration option
core/src/vfs/dev.rs	Updates import from axfs_ng to axfs
core/src/mm.rs	Updates import from axfs_ng to axfs
core/Cargo.toml	Updates dependency from axfs-ng to axfs
arceos	Updates submodule commit reference
api/src/vfs/proc.rs	Updates allocator API call from usage_stats() to usages()
api/src/vfs/mod.rs	Updates import from axfs_ng to axfs
api/src/vfs/dev/memtrack.rs	Updates module path references from axfs_ng to axfs
api/src/vfs/dev/loop.rs	Updates import from axfs_ng to axfs
api/src/vfs/dev/fb.rs	Updates display API calls from main_display() to framebuffer functions
api/src/task.rs	Updates task interrupt API from interrupted() to clear_interrupt()
api/src/syscall/task/execve.rs	Updates import from axfs_ng to axfs
api/src/syscall/task/clone.rs	Updates import from axfs_ng to axfs
api/src/syscall/sys.rs	Updates import from axfs_ng to axfs
api/src/syscall/signal.rs	Updates async context parameter naming and interrupt API
api/src/syscall/mm/mmap.rs	Updates import from axfs_ng to axfs
api/src/syscall/fs/stat.rs	Updates import from axfs_ng to axfs
api/src/syscall/fs/mount.rs	Updates import from axfs_ng to axfs
api/src/syscall/fs/memfd.rs	Updates import from axfs_ng to axfs
api/src/syscall/fs/io.rs	Updates import from axfs_ng to axfs
api/src/syscall/fs/fd_ops.rs	Updates module references from axfs_ng to axfs
api/src/syscall/fs/ctl.rs	Updates import from axfs_ng to axfs
api/src/file/mod.rs	Updates import from axfs_ng to axfs
api/src/file/fs.rs	Updates type references from axfs_ng to axfs
api/Cargo.toml	Updates dependency and feature flag from backtrace to dwarf
Makefile	Renames BACKTRACE option to DWARF
Cargo.toml	Updates dependencies and feature flags, including hashbrown version bump
.gitmodules	Updates arceos submodule branch from main to dev

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