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, 36 deletions

diff --git a/vendor/rustix/src/net/socketpair.rs b/vendor/rustix/src/net/socketpair.rs
deleted file mode 100644
index 29227f96..00000000
--- a/vendor/rustix/src/net/socketpair.rs
+++ /dev/null
@@ -1,36 +0,0 @@
-use crate::fd::OwnedFd;
-use crate::net::{AddressFamily, Protocol, SocketFlags, SocketType};
-use crate::{backend, io};
-
-/// `socketpair(domain, type_ | accept_flags, protocol)`—Create a pair of
-/// sockets that are connected to each other.
-///
-/// # References
-///  - [POSIX]
-///  - [Linux]
-///  - [Apple]
-///  - [FreeBSD]
-///  - [NetBSD]
-///  - [OpenBSD]
-///  - [DragonFly BSD]
-///  - [illumos]
-///  - [glibc]
-///
-/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9799919799/functions/socketpair.html
-/// [Linux]: https://man7.org/linux/man-pages/man2/socketpair.2.html
-/// [Apple]: https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/socketpair.2.html
-/// [FreeBSD]: https://man.freebsd.org/cgi/man.cgi?query=socketpair&sektion=2
-/// [NetBSD]: https://man.netbsd.org/socketpair.2
-/// [OpenBSD]: https://man.openbsd.org/socketpair.2
-/// [DragonFly BSD]: https://man.dragonflybsd.org/?command=socketpair&section=2
-/// [illumos]: https://illumos.org/man/3SOCKET/socketpair
-/// [glibc]: https://sourceware.org/glibc/manual/latest/html_node/Socket-Pairs.html
-#[inline]
-pub fn socketpair(
-    domain: AddressFamily,
-    type_: SocketType,
-    flags: SocketFlags,
-    protocol: Option<Protocol>,
-) -> io::Result<(OwnedFd, OwnedFd)> {
-    backend::net::syscalls::socketpair(domain, type_, flags, protocol)
-}