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/generic-array/src/impl_zeroize.rs b/vendor/generic-array/src/impl_zeroize.rs
deleted file mode 100644
index 4edf558f..00000000
--- a/vendor/generic-array/src/impl_zeroize.rs
+++ /dev/null
@@ -1,24 +0,0 @@
-use crate::{ArrayLength, GenericArray};
-
-use zeroize::Zeroize;
-
-impl<T: Zeroize, N: ArrayLength<T>> Zeroize for GenericArray<T, N> {
-    fn zeroize(&mut self) {
-        self.as_mut_slice().iter_mut().zeroize()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_zeroize() {
-        let mut array = GenericArray::<u8, typenum::U2>::default();
-        array[0] = 4;
-        array[1] = 9;
-        array.zeroize();
-        assert_eq!(array[0], 0);
-        assert_eq!(array[1], 0);
-    }
-}