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, 25 deletions

diff --git a/vendor/arrayvec/custom.css b/vendor/arrayvec/custom.css
deleted file mode 100644
index 8e0b7053..00000000
--- a/vendor/arrayvec/custom.css
+++ /dev/null
@@ -1,25 +0,0 @@
-
-.docblock pre.rust { background: #eeeeff; }
-pre.trait, pre.fn, pre.struct, pre.enum, pre.typedef { background: #fcfefc; }
-
-/* Small “example” label for doc examples */
-.docblock pre.rust::before {
-    content: "example";
-    float: right;
-    font-style: italic;
-    font-size: 0.8em;
-    margin-top: -10px;
-    margin-right: -5px;
-}
-
-
-/* Fixup where display in trait listing */
-pre.trait .where::before {
-content: '\a         ';
-}
-
-.docblock code {
-    background-color: inherit;
-    font-weight: bold;
-    padding: 0 0.1em;
-}