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, 28 deletions

diff --git a/vendor/ryu/src/digit_table.rs b/vendor/ryu/src/digit_table.rs
deleted file mode 100644
index d871f03f..00000000
--- a/vendor/ryu/src/digit_table.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-// Translated from C to Rust. The original C code can be found at
-// https://github.com/ulfjack/ryu and carries the following license:
-//
-// Copyright 2018 Ulf Adams
-//
-// The contents of this file may be used under the terms of the Apache License,
-// Version 2.0.
-//
-//    (See accompanying file LICENSE-Apache or copy at
-//     http://www.apache.org/licenses/LICENSE-2.0)
-//
-// Alternatively, the contents of this file may be used under the terms of
-// the Boost Software License, Version 1.0.
-//    (See accompanying file LICENSE-Boost or copy at
-//     https://www.boost.org/LICENSE_1_0.txt)
-//
-// Unless required by applicable law or agreed to in writing, this software
-// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
-// KIND, either express or implied.
-
-// A table of all two-digit numbers. This is used to speed up decimal digit
-// generation by copying pairs of digits into the final output.
-pub static DIGIT_TABLE: [u8; 200] = *b"\
-    0001020304050607080910111213141516171819\
-    2021222324252627282930313233343536373839\
-    4041424344454647484950515253545556575859\
-    6061626364656667686970717273747576777879\
-    8081828384858687888990919293949596979899";