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, 31 deletions

diff --git a/vendor/bitflags/src/tests/is_empty.rs b/vendor/bitflags/src/tests/is_empty.rs
deleted file mode 100644
index 92165f18..00000000
--- a/vendor/bitflags/src/tests/is_empty.rs
+++ /dev/null
@@ -1,31 +0,0 @@
-use super::*;
-
-use crate::Flags;
-
-#[test]
-fn cases() {
-    case(true, TestFlags::empty(), TestFlags::is_empty);
-
-    case(false, TestFlags::A, TestFlags::is_empty);
-    case(false, TestFlags::ABC, TestFlags::is_empty);
-    case(
-        false,
-        TestFlags::from_bits_retain(1 << 3),
-        TestFlags::is_empty,
-    );
-
-    case(true, TestZero::empty(), TestZero::is_empty);
-
-    case(true, TestEmpty::empty(), TestEmpty::is_empty);
-}
-
-#[track_caller]
-fn case<T: Flags + std::fmt::Debug>(expected: bool, value: T, inherent: impl FnOnce(&T) -> bool) {
-    assert_eq!(expected, inherent(&value), "{:?}.is_empty()", value);
-    assert_eq!(
-        expected,
-        Flags::is_empty(&value),
-        "Flags::is_empty({:?})",
-        value
-    );
-}