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, 23 deletions

diff --git a/vendor/rustix/src/ffi.rs b/vendor/rustix/src/ffi.rs
deleted file mode 100644
index 073b6b12..00000000
--- a/vendor/rustix/src/ffi.rs
+++ /dev/null
@@ -1,23 +0,0 @@
-//! Utilities related to FFI bindings.
-
-// If we have std, use it.
-#[cfg(not(windows))]
-#[cfg(feature = "std")]
-pub use std::ffi::{CStr, CString, FromBytesWithNulError, NulError};
-#[cfg(feature = "std")]
-pub use std::os::raw::{
-    c_char, c_int, c_long, c_longlong, c_short, c_uint, c_ulong, c_ulonglong, c_ushort, c_void,
-};
-
-// If we don't have std, we can depend on core and alloc having these features
-// in Rust 1.64+.
-#[cfg(not(windows))]
-#[cfg(all(feature = "alloc", not(feature = "std")))]
-pub use alloc::ffi::{CString, NulError};
-#[cfg(not(feature = "std"))]
-pub use core::ffi::{
-    c_char, c_int, c_long, c_longlong, c_short, c_uint, c_ulong, c_ulonglong, c_ushort, c_void,
-};
-#[cfg(not(windows))]
-#[cfg(not(feature = "std"))]
-pub use core::ffi::{CStr, FromBytesWithNulError};