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, 27 deletions

diff --git a/vendor/bytes/src/fmt/hex.rs b/vendor/bytes/src/fmt/hex.rs
deleted file mode 100644
index 1203b419..00000000
--- a/vendor/bytes/src/fmt/hex.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-use core::fmt::{Formatter, LowerHex, Result, UpperHex};
-
-use super::BytesRef;
-use crate::{Bytes, BytesMut};
-
-impl LowerHex for BytesRef<'_> {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
-        for &b in self.0 {
-            write!(f, "{:02x}", b)?;
-        }
-        Ok(())
-    }
-}
-
-impl UpperHex for BytesRef<'_> {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result {
-        for &b in self.0 {
-            write!(f, "{:02X}", b)?;
-        }
-        Ok(())
-    }
-}
-
-fmt_impl!(LowerHex, Bytes);
-fmt_impl!(LowerHex, BytesMut);
-fmt_impl!(UpperHex, Bytes);
-fmt_impl!(UpperHex, BytesMut);