refactor: axtask

[AsakuraMizu]

Adapt to Starry-OS/arceos#19.

This is in preparation for a smoother transition to the new version of arceos.

[Copilot]

Pull request overview

This PR refactors the codebase to adapt to changes in the axtask module API (arceos PR #19), updating task extension types and async polling patterns throughout the system.

• Renamed TaskExtProxy to AxTaskExt across task creation code
• Replaced Poller API with new poll_io and block_on functions for async I/O operations
• Updated spawn calls to spawn_with_name where task names are provided
• Added .unwrap() to task.join() call to handle new return type

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/entry.rs	Updated task extension type and added unwrap to join call
core/src/config/*.rs	Reformatted kernel stack size constant with underscore separator
arceos	Updated submodule commit reference
api/src/vfs/dev/tty/ntty.rs	Changed IRQ waker registration import path
api/src/vfs/dev/tty.rs	Migrated from Poller to poll_io/block_on pattern
api/src/vfs/dev/log.rs	Updated spawn to spawn_with_name
api/src/vfs/dev/fb.rs	Updated spawn to spawn_with_name
api/src/terminal/ldisc.rs	Migrated polling logic to poll_io/block_on pattern
api/src/syscall/task/clone.rs	Updated task extension type name
api/src/syscall/io_mpx/*.rs	Migrated select/poll/epoll from Poller to timeout+poll_io pattern
api/src/file/*.rs	Migrated file I/O operations from Poller to poll_io/block_on pattern

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