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, 13 deletions

diff --git a/vendor/rustix/src/backend/linux_raw/fs/mod.rs b/vendor/rustix/src/backend/linux_raw/fs/mod.rs
deleted file mode 100644
index 9f53c5db..00000000
--- a/vendor/rustix/src/backend/linux_raw/fs/mod.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-#[cfg(feature = "alloc")]
-pub(crate) mod dir;
-pub mod inotify;
-pub(crate) mod makedev;
-pub(crate) mod syscalls;
-pub(crate) mod types;
-
-// TODO: Fix linux-raw-sys to define ioctl codes for sparc.
-#[cfg(any(target_arch = "sparc", target_arch = "sparc64"))]
-pub(crate) const EXT4_IOC_RESIZE_FS: u32 = 0x8008_6610;
-
-#[cfg(not(any(target_arch = "sparc", target_arch = "sparc64")))]
-pub(crate) use linux_raw_sys::ioctl::EXT4_IOC_RESIZE_FS;