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, 19 deletions

diff --git a/vendor/ryu/src/parse.rs b/vendor/ryu/src/parse.rs
deleted file mode 100644
index 00f79836..00000000
--- a/vendor/ryu/src/parse.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-use core::fmt::{self, Display};
-
-#[derive(Copy, Clone, Debug)]
-pub enum Error {
-    InputTooShort,
-    InputTooLong,
-    MalformedInput,
-}
-
-impl Display for Error {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        let msg = match self {
-            Error::InputTooShort => "input too short",
-            Error::InputTooLong => "input too long",
-            Error::MalformedInput => "malformed input",
-        };
-        formatter.write_str(msg)
-    }
-}