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, 27 deletions

diff --git a/vendor/time/src/interop/js_sys_date_offsetdatetime.rs b/vendor/time/src/interop/js_sys_date_offsetdatetime.rs
deleted file mode 100644
index ecbd601e..00000000
--- a/vendor/time/src/interop/js_sys_date_offsetdatetime.rs
+++ /dev/null
@@ -1,27 +0,0 @@
-use num_conv::prelude::*;
-
-use crate::convert::*;
-use crate::OffsetDateTime;
-
-impl From<js_sys::Date> for OffsetDateTime {
-    /// # Panics
-    ///
-    /// This may panic if the timestamp can not be represented.
-    fn from(js_date: js_sys::Date) -> Self {
-        // get_time() returns milliseconds
-        let timestamp_nanos = js_date.get_time() as i128
-            * Nanosecond::per(Millisecond).cast_signed().extend::<i128>();
-        Self::from_unix_timestamp_nanos(timestamp_nanos)
-            .expect("invalid timestamp: Timestamp cannot fit in range")
-    }
-}
-
-impl From<OffsetDateTime> for js_sys::Date {
-    fn from(datetime: OffsetDateTime) -> Self {
-        // new Date() takes milliseconds
-        let timestamp = (datetime.unix_timestamp_nanos()
-            / Nanosecond::per(Millisecond).cast_signed().extend::<i128>())
-            as f64;
-        Self::new(&timestamp.into())
-    }
-}