Better virtual file system, keyboard through MMIO&VirtIO

crates/os-std/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2024"
 [dependencies]
 os-std-macros = { path = "../os-std-macros" }
 shared = { path = "../shared", features = ["user"] }
+io = { path = "../io", features = ["alloc"] }

crates/os-std/src/io.rs

@@ -0,0 +1 @@
+pub use io::SeekFrom;

crates/os-std/src/lib.rs

@@ -2,6 +2,7 @@
 
 extern crate alloc;
 
+pub mod io;
 pub mod prelude;
 
 pub use shared::fs;