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, 16 deletions

diff --git a/vendor/thiserror/tests/ui/missing-display.stderr b/vendor/thiserror/tests/ui/missing-display.stderr
deleted file mode 100644
index f7a044bd..00000000
--- a/vendor/thiserror/tests/ui/missing-display.stderr
+++ /dev/null
@@ -1,16 +0,0 @@
-error[E0277]: `MyError` doesn't implement `std::fmt::Display`
- --> tests/ui/missing-display.rs:4:10
-  |
-3 | #[derive(Error, Debug)]
-  |          ----- in this derive macro expansion
-4 | pub enum MyError {
-  |          ^^^^^^^ `MyError` cannot be formatted with the default formatter
-  |
-  = help: the trait `std::fmt::Display` is not implemented for `MyError`
-  = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
-note: required by a bound in `std::error::Error`
- --> $RUST/core/src/error.rs
-  |
-  | pub trait Error: Debug + Display {
-  |                          ^^^^^^^ required by this bound in `Error`
-  = note: this error originates in the derive macro `Error` (in Nightly builds, run with -Z macro-backtrace for more info)