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, 44 deletions

diff --git a/vendor/arrayvec/src/maybe_uninit.rs b/vendor/arrayvec/src/maybe_uninit.rs
deleted file mode 100644
index e009abfc..00000000
--- a/vendor/arrayvec/src/maybe_uninit.rs
+++ /dev/null
@@ -1,44 +0,0 @@
-
-
-use crate::array::Array;
-use std::mem::MaybeUninit as StdMaybeUninit;
-
-#[derive(Copy)]
-pub struct MaybeUninit<T> {
-    inner: StdMaybeUninit<T>,
-}
-
-impl<T> Clone for MaybeUninit<T>
-    where T: Copy
-{
-    fn clone(&self) -> Self { *self }
-}
-
-impl<T> MaybeUninit<T> {
-    /// Create a new MaybeUninit with uninitialized interior
-    pub const unsafe fn uninitialized() -> Self {
-        MaybeUninit { inner: StdMaybeUninit::uninit() }
-    }
-
-    /// Create a new MaybeUninit from the value `v`.
-    pub fn from(v: T) -> Self {
-        MaybeUninit { inner: StdMaybeUninit::new(v) }
-    }
-
-    // Raw pointer casts written so that we don't reference or access the
-    // uninitialized interior value
-
-    /// Return a raw pointer to the start of the interior array
-    pub fn ptr(&self) -> *const T::Item
-        where T: Array
-    {
-        self.inner.as_ptr() as *const T::Item
-    }
-
-    /// Return a mut raw pointer to the start of the interior array
-    pub fn ptr_mut(&mut self) -> *mut T::Item
-        where T: Array
-    {
-        self.inner.as_mut_ptr() as *mut T::Item
-    }
-}