feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

1 files changed, 0 insertions, 58 deletions

diff --git a/vendor/rustix/src/backend/libc/io/windows_syscalls.rs b/vendor/rustix/src/backend/libc/io/windows_syscalls.rs
deleted file mode 100644
index 0f953d7f..00000000
--- a/vendor/rustix/src/backend/libc/io/windows_syscalls.rs
+++ /dev/null
@@ -1,58 +0,0 @@
-//! Windows system calls in the `io` module.
-
-use crate::backend::c;
-#[cfg(feature = "try_close")]
-use crate::backend::conv::ret;
-use crate::backend::conv::{borrowed_fd, ret_c_int, ret_send_recv, send_recv_len};
-use crate::fd::{BorrowedFd, RawFd};
-use crate::io;
-use crate::ioctl::{IoctlOutput, Opcode};
-
-pub(crate) unsafe fn read(fd: BorrowedFd<'_>, buf: (*mut u8, usize)) -> io::Result<usize> {
-    // `read` on a socket is equivalent to `recv` with no flags.
-    ret_send_recv(c::recv(
-        borrowed_fd(fd),
-        buf.0.cast(),
-        send_recv_len(buf.1),
-        0,
-    ))
-}
-
-pub(crate) fn write(fd: BorrowedFd<'_>, buf: &[u8]) -> io::Result<usize> {
-    // `write` on a socket is equivalent to `send` with no flags.
-    unsafe {
-        ret_send_recv(c::send(
-            borrowed_fd(fd),
-            buf.as_ptr().cast(),
-            send_recv_len(buf.len()),
-            0,
-        ))
-    }
-}
-
-pub(crate) unsafe fn close(raw_fd: RawFd) {
-    let _ = c::closesocket(raw_fd as c::SOCKET);
-}
-
-#[cfg(feature = "try_close")]
-pub(crate) unsafe fn try_close(raw_fd: RawFd) -> io::Result<()> {
-    ret(c::closesocket(raw_fd as c::SOCKET))
-}
-
-#[inline]
-pub(crate) unsafe fn ioctl(
-    fd: BorrowedFd<'_>,
-    request: Opcode,
-    arg: *mut c::c_void,
-) -> io::Result<IoctlOutput> {
-    ret_c_int(c::ioctl(borrowed_fd(fd), request, arg.cast()))
-}
-
-#[inline]
-pub(crate) unsafe fn ioctl_readonly(
-    fd: BorrowedFd<'_>,
-    request: Opcode,
-    arg: *mut c::c_void,
-) -> io::Result<IoctlOutput> {
-    ioctl(fd, request, arg)
-}