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, 24 deletions

diff --git a/vendor/smallvec/tests/macro.rs b/vendor/smallvec/tests/macro.rs
deleted file mode 100644
index fa52e79b..00000000
--- a/vendor/smallvec/tests/macro.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-/// This file tests `smallvec!` without actually having the macro in scope.
-/// This forces any recursion to use a `$crate` prefix to reliably find itself.
-
-#[test]
-fn smallvec() {
-    let mut vec: smallvec::SmallVec<[i32; 2]>;
-
-    macro_rules! check {
-        ($init:tt) => {
-            vec = smallvec::smallvec! $init;
-            assert_eq!(*vec, *vec! $init);
-        }
-    }
-
-    check!([0; 0]);
-    check!([1; 1]);
-    check!([2; 2]);
-    check!([3; 3]);
-
-    check!([]);
-    check!([1]);
-    check!([1, 2]);
-    check!([1, 2, 3]);
-}