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, 40 deletions

diff --git a/vendor/bytes/src/buf/vec_deque.rs b/vendor/bytes/src/buf/vec_deque.rs
deleted file mode 100644
index 55d5636b..00000000
--- a/vendor/bytes/src/buf/vec_deque.rs
+++ /dev/null
@@ -1,40 +0,0 @@
-use alloc::collections::VecDeque;
-#[cfg(feature = "std")]
-use std::io;
-
-use super::Buf;
-
-impl Buf for VecDeque<u8> {
-    fn remaining(&self) -> usize {
-        self.len()
-    }
-
-    fn chunk(&self) -> &[u8] {
-        let (s1, s2) = self.as_slices();
-        if s1.is_empty() {
-            s2
-        } else {
-            s1
-        }
-    }
-
-    #[cfg(feature = "std")]
-    fn chunks_vectored<'a>(&'a self, dst: &mut [io::IoSlice<'a>]) -> usize {
-        if self.is_empty() || dst.is_empty() {
-            return 0;
-        }
-
-        let (s1, s2) = self.as_slices();
-        dst[0] = io::IoSlice::new(s1);
-        if s2.is_empty() || dst.len() == 1 {
-            return 1;
-        }
-
-        dst[1] = io::IoSlice::new(s2);
-        2
-    }
-
-    fn advance(&mut self, cnt: usize) {
-        self.drain(..cnt);
-    }
-}