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, 17 deletions

diff --git a/vendor/time/src/sys/refresh_tz/mod.rs b/vendor/time/src/sys/refresh_tz/mod.rs
deleted file mode 100644
index 90ddaa99..00000000
--- a/vendor/time/src/sys/refresh_tz/mod.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-#[cfg_attr(target_family = "unix", path = "unix.rs")]
-mod imp;
-
-/// Update time zone information from the system.
-///
-/// For safety documentation, see [`time::util::refresh_tz`].
-pub(crate) unsafe fn refresh_tz_unchecked() {
-    // Safety: The caller must uphold the safety requirements.
-    unsafe { imp::refresh_tz_unchecked() }
-}
-
-/// Attempt to update time zone information from the system.
-///
-/// Returns `None` if the call is not known to be sound.
-pub(crate) fn refresh_tz() -> Option<()> {
-    imp::refresh_tz()
-}