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, 65 deletions

diff --git a/vendor/bitflags/src/example_generated.rs b/vendor/bitflags/src/example_generated.rs
deleted file mode 100644
index abb1118f..00000000
--- a/vendor/bitflags/src/example_generated.rs
+++ /dev/null
@@ -1,65 +0,0 @@
-//! This module shows an example of code generated by the macro. **IT MUST NOT BE USED OUTSIDE THIS
-//! CRATE**.
-//!
-//! Usually, when you call the `bitflags!` macro, only the `Flags` type would be visible. In this
-//! example, the `Field0`, `Iter`, and `IterRaw` types are also exposed so that you can explore
-//! their APIs. The `Field0` type can be accessed as `self.0` on an instance of `Flags`.
-
-__declare_public_bitflags! {
-    /// This is the same `Flags` struct defined in the [crate level example](../index.html#example).
-    /// Note that this struct is just for documentation purposes only, it must not be used outside
-    /// this crate.
-    pub struct Flags
-}
-
-__declare_internal_bitflags! {
-    pub struct Field0: u32
-}
-
-__impl_internal_bitflags! {
-    Field0: u32, Flags {
-        // Field `A`.
-        ///
-        /// This flag has the value `0b00000001`.
-        const A = 0b00000001;
-        /// Field `B`.
-        ///
-        /// This flag has the value `0b00000010`.
-        const B = 0b00000010;
-        /// Field `C`.
-        ///
-        /// This flag has the value `0b00000100`.
-        const C = 0b00000100;
-        const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits();
-    }
-}
-
-__impl_public_bitflags_forward! {
-    Flags: u32, Field0
-}
-
-__impl_public_bitflags_ops! {
-    Flags
-}
-
-__impl_public_bitflags_iter! {
-    Flags: u32, Flags
-}
-
-__impl_public_bitflags_consts! {
-    Flags: u32 {
-        /// Field `A`.
-        ///
-        /// This flag has the value `0b00000001`.
-        const A = 0b00000001;
-        /// Field `B`.
-        ///
-        /// This flag has the value `0b00000010`.
-        const B = 0b00000010;
-        /// Field `C`.
-        ///
-        /// This flag has the value `0b00000100`.
-        const C = 0b00000100;
-        const ABC = Self::A.bits() | Self::B.bits() | Self::C.bits();
-    }
-}