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, 92 deletions

diff --git a/vendor/bitflags/src/tests/difference.rs b/vendor/bitflags/src/tests/difference.rs
deleted file mode 100644
index 6ce9c0bf..00000000
--- a/vendor/bitflags/src/tests/difference.rs
+++ /dev/null
@@ -1,92 +0,0 @@
-use super::*;
-
-use crate::Flags;
-
-#[test]
-fn cases() {
-    case(
-        TestFlags::A | TestFlags::B,
-        &[
-            (TestFlags::A, 1 << 1),
-            (TestFlags::B, 1),
-            (TestFlags::from_bits_retain(1 << 3), 1 | 1 << 1),
-        ],
-        TestFlags::difference,
-    );
-
-    case(
-        TestFlags::from_bits_retain(1 | 1 << 3),
-        &[
-            (TestFlags::A, 1 << 3),
-            (TestFlags::from_bits_retain(1 << 3), 1),
-        ],
-        TestFlags::difference,
-    );
-
-    case(
-        TestExternal::from_bits_retain(!0),
-        &[(TestExternal::A, 0b1111_1110)],
-        TestExternal::difference,
-    );
-
-    assert_eq!(
-        0b1111_1110,
-        (TestExternal::from_bits_retain(!0) & !TestExternal::A).bits()
-    );
-
-    assert_eq!(
-        0b1111_1110,
-        (TestFlags::from_bits_retain(!0).difference(TestFlags::A)).bits()
-    );
-
-    // The `!` operator unsets bits that don't correspond to known flags
-    assert_eq!(
-        1 << 1 | 1 << 2,
-        (TestFlags::from_bits_retain(!0) & !TestFlags::A).bits()
-    );
-}
-
-#[track_caller]
-fn case<T: Flags + std::fmt::Debug + std::ops::Sub<Output = T> + std::ops::SubAssign + Copy>(
-    value: T,
-    inputs: &[(T, T::Bits)],
-    mut inherent: impl FnMut(T, T) -> T,
-) where
-    T::Bits: std::fmt::Debug + PartialEq + Copy,
-{
-    for (input, expected) in inputs {
-        assert_eq!(
-            *expected,
-            inherent(value, *input).bits(),
-            "{:?}.difference({:?})",
-            value,
-            input
-        );
-        assert_eq!(
-            *expected,
-            Flags::difference(value, *input).bits(),
-            "Flags::difference({:?}, {:?})",
-            value,
-            input
-        );
-        assert_eq!(
-            *expected,
-            (value - *input).bits(),
-            "{:?} - {:?}",
-            value,
-            input
-        );
-        assert_eq!(
-            *expected,
-            {
-                let mut value = value;
-                value -= *input;
-                value
-            }
-            .bits(),
-            "{:?} -= {:?}",
-            value,
-            input,
-        );
-    }
-}