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, 39 deletions

diff --git a/vendor/bytes/src/buf/mod.rs b/vendor/bytes/src/buf/mod.rs
deleted file mode 100644
index 1bf0a47e..00000000
--- a/vendor/bytes/src/buf/mod.rs
+++ /dev/null
@@ -1,39 +0,0 @@
-//! Utilities for working with buffers.
-//!
-//! A buffer is any structure that contains a sequence of bytes. The bytes may
-//! or may not be stored in contiguous memory. This module contains traits used
-//! to abstract over buffers as well as utilities for working with buffer types.
-//!
-//! # `Buf`, `BufMut`
-//!
-//! These are the two foundational traits for abstractly working with buffers.
-//! They can be thought as iterators for byte structures. They offer additional
-//! performance over `Iterator` by providing an API optimized for byte slices.
-//!
-//! See [`Buf`] and [`BufMut`] for more details.
-//!
-//! [rope]: https://en.wikipedia.org/wiki/Rope_(data_structure)
-
-mod buf_impl;
-mod buf_mut;
-mod chain;
-mod iter;
-mod limit;
-#[cfg(feature = "std")]
-mod reader;
-mod take;
-mod uninit_slice;
-mod vec_deque;
-#[cfg(feature = "std")]
-mod writer;
-
-pub use self::buf_impl::Buf;
-pub use self::buf_mut::BufMut;
-pub use self::chain::Chain;
-pub use self::iter::IntoIter;
-pub use self::limit::Limit;
-pub use self::take::Take;
-pub use self::uninit_slice::UninitSlice;
-
-#[cfg(feature = "std")]
-pub use self::{reader::Reader, writer::Writer};