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, 51 deletions

diff --git a/vendor/thiserror-impl/Cargo.toml b/vendor/thiserror-impl/Cargo.toml
deleted file mode 100644
index 28e890cc..00000000
--- a/vendor/thiserror-impl/Cargo.toml
+++ /dev/null
@@ -1,51 +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 = "2021"
-rust-version = "1.61"
-name = "thiserror-impl"
-version = "2.0.12"
-authors = ["David Tolnay <dtolnay@gmail.com>"]
-build = false
-autolib = false
-autobins = false
-autoexamples = false
-autotests = false
-autobenches = false
-description = "Implementation detail of the `thiserror` crate"
-readme = false
-license = "MIT OR Apache-2.0"
-repository = "https://github.com/dtolnay/thiserror"
-
-[package.metadata.docs.rs]
-rustdoc-args = [
-    "--generate-link-to-definition",
-    "--extern-html-root-url=core=https://doc.rust-lang.org",
-    "--extern-html-root-url=alloc=https://doc.rust-lang.org",
-    "--extern-html-root-url=std=https://doc.rust-lang.org",
-    "--extern-html-root-url=proc_macro=https://doc.rust-lang.org",
-]
-targets = ["x86_64-unknown-linux-gnu"]
-
-[lib]
-name = "thiserror_impl"
-path = "src/lib.rs"
-proc-macro = true
-
-[dependencies.proc-macro2]
-version = "1.0.74"
-
-[dependencies.quote]
-version = "1.0.35"
-
-[dependencies.syn]
-version = "2.0.87"