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, 18 deletions

diff --git a/vendor/hyper-util/src/lib.rs b/vendor/hyper-util/src/lib.rs
deleted file mode 100644
index ac8f89b1..00000000
--- a/vendor/hyper-util/src/lib.rs
+++ /dev/null
@@ -1,18 +0,0 @@
-#![deny(missing_docs)]
-#![cfg_attr(docsrs, feature(doc_auto_cfg, doc_cfg))]
-
-//! Utilities for working with hyper.
-//!
-//! This crate is less-stable than [`hyper`](https://docs.rs/hyper). However,
-//! does respect Rust's semantic version regarding breaking changes.
-
-#[cfg(feature = "client")]
-pub mod client;
-mod common;
-pub mod rt;
-#[cfg(feature = "server")]
-pub mod server;
-#[cfg(any(feature = "service", feature = "client-legacy"))]
-pub mod service;
-
-mod error;