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, 67 deletions

diff --git a/vendor/unicode-script/Cargo.toml b/vendor/unicode-script/Cargo.toml
deleted file mode 100644
index cd5dab29..00000000
--- a/vendor/unicode-script/Cargo.toml
+++ /dev/null
@@ -1,67 +0,0 @@
-# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
-#
-# When uploading crates to the registry Cargo will automatically
-# "normalize" Cargo.toml files for maximal compatibility
-# with all versions of Cargo and also rewrite `path` dependencies
-# to registry (e.g., crates.io) dependencies.
-#
-# If you are reading this file be aware that the original Cargo.toml
-# will likely look very different (and much more reasonable).
-# See Cargo.toml.orig for the original contents.
-
-[package]
-edition = "2018"
-name = "unicode-script"
-version = "0.5.7"
-authors = ["Manish Goregaokar <manishsmail@gmail.com>"]
-build = false
-exclude = [
-    "target/*",
-    "Cargo.lock",
-    "scripts/tmp",
-    "*.txt",
-]
-autobins = false
-autoexamples = false
-autotests = false
-autobenches = false
-description = """
-This crate exposes the Unicode `Script` and `Script_Extension` properties from [UAX #24](http://www.unicode.org/reports/tr24/)
-"""
-homepage = "https://github.com/unicode-rs/unicode-script"
-documentation = "https://docs.rs/unicode-script"
-readme = "README.md"
-keywords = [
-    "text",
-    "unicode",
-    "script",
-    "language",
-]
-license = "MIT OR Apache-2.0"
-repository = "https://github.com/unicode-rs/unicode-script"
-
-[lib]
-name = "unicode_script"
-path = "src/lib.rs"
-
-[dependencies.compiler_builtins]
-version = "0.1"
-optional = true
-
-[dependencies.core]
-version = "1.0"
-optional = true
-package = "rustc-std-workspace-core"
-
-[dependencies.std]
-version = "1.0"
-optional = true
-package = "rustc-std-workspace-std"
-
-[features]
-bench = []
-rustc-dep-of-std = [
-    "std",
-    "core",
-    "compiler_builtins",
-]