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, 42 deletions

diff --git a/vendor/beef/src/wide.rs b/vendor/beef/src/wide.rs
deleted file mode 100644
index 466e594c..00000000
--- a/vendor/beef/src/wide.rs
+++ /dev/null
@@ -1,42 +0,0 @@
-use crate::traits::Capacity;
-use core::num::NonZeroUsize;
-
-/// Compact three word `Cow` that puts the ownership tag in capacity.
-/// This is a type alias, for documentation see [`beef::generic::Cow`](./generic/struct.Cow.html).
-pub type Cow<'a, T> = crate::generic::Cow<'a, T, Wide>;
-
-pub(crate) mod internal {
-    #[derive(Clone, Copy, PartialEq, Eq)]
-    pub struct Wide;
-}
-use internal::Wide;
-
-impl Capacity for Wide {
-    type Field = Option<NonZeroUsize>;
-    type NonZero = NonZeroUsize;
-
-    #[inline]
-    fn len(fat: usize) -> usize {
-        fat
-    }
-
-    #[inline]
-    fn empty(len: usize) -> (usize, Self::Field) {
-        (len, None)
-    }
-
-    #[inline]
-    fn store(len: usize, capacity: usize) -> (usize, Self::Field) {
-        (len, NonZeroUsize::new(capacity))
-    }
-
-    #[inline]
-    fn unpack(fat: usize, capacity: NonZeroUsize) -> (usize, usize) {
-        (fat, capacity.get())
-    }
-
-    #[inline]
-    fn maybe(_: usize, capacity: Option<NonZeroUsize>) -> Option<NonZeroUsize> {
-        capacity
-    }
-}