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, 28 deletions

diff --git a/vendor/indexmap/tests/tests.rs b/vendor/indexmap/tests/tests.rs
deleted file mode 100644
index 7d522f1c..00000000
--- a/vendor/indexmap/tests/tests.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-use indexmap::{indexmap, indexset};
-
-#[test]
-fn test_sort() {
-    let m = indexmap! {
-        1 => 2,
-        7 => 1,
-        2 => 2,
-        3 => 3,
-    };
-
-    itertools::assert_equal(
-        m.sorted_by(|_k1, v1, _k2, v2| v1.cmp(v2)),
-        vec![(7, 1), (1, 2), (2, 2), (3, 3)],
-    );
-}
-
-#[test]
-fn test_sort_set() {
-    let s = indexset! {
-        1,
-        7,
-        2,
-        3,
-    };
-
-    itertools::assert_equal(s.sorted_by(|v1, v2| v1.cmp(v2)), vec![1, 2, 3, 7]);
-}