refactor!: move {Async,Poll}Fd to runtime

[George-Miao]

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[Copilot]

Pull request overview

This PR refactors the codebase by moving AsyncFd and PollFd from their respective crates (compio-fs and compio-net) into a centralized compio-runtime crate under a new fd module. This consolidation improves code organization by placing these fundamental file descriptor wrappers in the runtime layer where they logically belong.

Changes:

• Created a new fd module in compio-runtime with PollFd and AsyncFd types
• Added an async-fd feature flag to compio-runtime for optional AsyncFd functionality
• Updated all imports in dependent crates (compio-net, compio-fs) to use the new centralized location

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
compio-runtime/src/lib.rs	Adds public fd module to runtime
compio-runtime/src/fd/mod.rs	New module entry point with feature-gated exports
compio-runtime/src/fd/poll_fd/mod.rs	Updated documentation and made from_shared_fd public
compio-runtime/src/fd/poll_fd/unix.rs	Changed internal path from compio_runtime:: to crate::
compio-runtime/src/fd/poll_fd/windows.rs	Changed internal path from compio_runtime:: to crate::
compio-runtime/src/fd/async_fd/mod.rs	Restructured to move platform-specific impls to separate files, added Splittable trait
compio-runtime/src/fd/async_fd/windows.rs	Platform-specific Windows trait implementations for AsyncFd
compio-runtime/src/fd/async_fd/unix.rs	Platform-specific Unix trait implementations for AsyncFd
compio-runtime/Cargo.toml	Added optional compio-io dependency and async-fd feature
compio-net/src/lib.rs	Removed poll_fd module export
compio-net/src/tcp.rs	Updated import to use compio_runtime::fd::PollFd
compio-net/src/unix.rs	Updated import to use compio_runtime::fd::PollFd
compio-net/src/socket.rs	Updated import to use compio_runtime::fd::PollFd
compio-net/tests/poll.rs	Updated import to use compio_runtime::fd::PollFd
compio-fs/src/lib.rs	Removed async_fd module export
compio-fs/src/stdio/unix.rs	Updated import to use compio_runtime::fd::AsyncFd
compio-fs/src/named_pipe.rs	Updated import to use compio_runtime::fd::AsyncFd
compio-fs/Cargo.toml	Added async-fd feature to compio-runtime dependency

Comments suppressed due to low confidence (1)

compio-runtime/src/fd/poll_fd/mod.rs:25

• Grammar error: "Ready-based sources does not need" should be "Ready-based sources do not need" (subject-verb agreement). The subject "sources" is plural and requires the plural verb form "do".

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