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, 63 deletions

diff --git a/vendor/time/src/serde/timestamp/microseconds.rs b/vendor/time/src/serde/timestamp/microseconds.rs
deleted file mode 100644
index 65c603ec..00000000
--- a/vendor/time/src/serde/timestamp/microseconds.rs
+++ /dev/null
@@ -1,63 +0,0 @@
-//! Treat an [`OffsetDateTime`] as a [Unix timestamp] with microseconds for
-//! the purposes of serde.
-//!
-//! Use this module in combination with serde's [`#[with]`][with] attribute.
-//!
-//! When deserializing, the offset is assumed to be UTC.
-//!
-//! [Unix timestamp]: https://en.wikipedia.org/wiki/Unix_time
-//! [with]: https://serde.rs/field-attrs.html#with
-
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
-
-use crate::OffsetDateTime;
-
-/// Serialize an `OffsetDateTime` as its Unix timestamp with microseconds
-pub fn serialize<S: Serializer>(
-    datetime: &OffsetDateTime,
-    serializer: S,
-) -> Result<S::Ok, S::Error> {
-    let timestamp = datetime.unix_timestamp_nanos() / 1_000;
-    timestamp.serialize(serializer)
-}
-
-/// Deserialize an `OffsetDateTime` from its Unix timestamp with microseconds
-pub fn deserialize<'a, D: Deserializer<'a>>(deserializer: D) -> Result<OffsetDateTime, D::Error> {
-    let value: i128 = <_>::deserialize(deserializer)?;
-    OffsetDateTime::from_unix_timestamp_nanos(value * 1_000)
-        .map_err(|err| de::Error::invalid_value(de::Unexpected::Signed(err.value), &err))
-}
-
-/// Treat an `Option<OffsetDateTime>` as a [Unix timestamp] with microseconds
-/// for the purposes of serde.
-///
-/// Use this module in combination with serde's [`#[with]`][with] attribute.
-///
-/// When deserializing, the offset is assumed to be UTC.
-///
-/// [Unix timestamp]: https://en.wikipedia.org/wiki/Unix_time
-/// [with]: https://serde.rs/field-attrs.html#with
-pub mod option {
-    #[allow(clippy::wildcard_imports)]
-    use super::*;
-
-    /// Serialize an `Option<OffsetDateTime>` as its Unix timestamp with microseconds
-    pub fn serialize<S: Serializer>(
-        option: &Option<OffsetDateTime>,
-        serializer: S,
-    ) -> Result<S::Ok, S::Error> {
-        option
-            .map(|timestamp| timestamp.unix_timestamp_nanos() / 1_000)
-            .serialize(serializer)
-    }
-
-    /// Deserialize an `Option<OffsetDateTime>` from its Unix timestamp with microseconds
-    pub fn deserialize<'a, D: Deserializer<'a>>(
-        deserializer: D,
-    ) -> Result<Option<OffsetDateTime>, D::Error> {
-        Option::deserialize(deserializer)?
-            .map(|value: i128| OffsetDateTime::from_unix_timestamp_nanos(value * 1_000))
-            .transpose()
-            .map_err(|err| de::Error::invalid_value(de::Unexpected::Signed(err.value), &err))
-    }
-}