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, 66 deletions

diff --git a/vendor/string_cache/Cargo.toml b/vendor/string_cache/Cargo.toml
deleted file mode 100644
index 9829e3ea..00000000
--- a/vendor/string_cache/Cargo.toml
+++ /dev/null
@@ -1,66 +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"
-rust-version = "1.70.0"
-name = "string_cache"
-version = "0.8.9"
-authors = ["The Servo Project Developers"]
-build = false
-autolib = false
-autobins = false
-autoexamples = false
-autotests = false
-autobenches = false
-description = "A string interning library for Rust, developed as part of the Servo project."
-documentation = "https://docs.rs/string_cache"
-readme = "README.md"
-license = "MIT OR Apache-2.0"
-repository = "https://github.com/servo/string-cache"
-
-[lib]
-name = "string_cache"
-path = "src/lib.rs"
-
-[[example]]
-name = "simple"
-path = "examples/simple.rs"
-
-[[test]]
-name = "small-stack"
-path = "tests/small-stack.rs"
-harness = false
-
-[dependencies.malloc_size_of]
-version = "0.1"
-optional = true
-default-features = false
-
-[dependencies.new_debug_unreachable]
-version = "1.0.2"
-
-[dependencies.parking_lot]
-version = "0.12"
-
-[dependencies.phf_shared]
-version = "0.11"
-
-[dependencies.precomputed-hash]
-version = "0.1"
-
-[dependencies.serde]
-version = "1"
-optional = true
-
-[features]
-default = ["serde_support"]
-serde_support = ["serde"]