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, 25 deletions

diff --git a/vendor/walkdir/src/util.rs b/vendor/walkdir/src/util.rs
deleted file mode 100644
index b9fcad8b..00000000
--- a/vendor/walkdir/src/util.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-use std::io;
-use std::path::Path;
-
-#[cfg(unix)]
-pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
-    use std::os::unix::fs::MetadataExt;
-
-    path.as_ref().metadata().map(|md| md.dev())
-}
-
-#[cfg(windows)]
-pub fn device_num<P: AsRef<Path>>(path: P) -> io::Result<u64> {
-    use winapi_util::{file, Handle};
-
-    let h = Handle::from_path_any(path)?;
-    file::information(h).map(|info| info.volume_serial_number())
-}
-
-#[cfg(not(any(unix, windows)))]
-pub fn device_num<P: AsRef<Path>>(_: P) -> io::Result<u64> {
-    Err(io::Error::new(
-        io::ErrorKind::Other,
-        "walkdir: same_file_system option not supported on this platform",
-    ))
-}