feat: add openapi generator and error schemas

engine/packages/openapi-gen/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "openapi-gen"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+[dependencies]
+
+[build-dependencies]
+sandbox-daemon = { path = "../sandbox-daemon" }
+serde_json = "1.0"
+utoipa = "4.2"

engine/packages/openapi-gen/build.rs

@@ -0,0 +1,20 @@
+use std::fs;
+use std::path::Path;
+
+use sandbox_daemon::router::ApiDoc;
+use utoipa::OpenApi;
+
+fn main() {
+    println!("cargo:rerun-if-changed=../sandbox-daemon/src/router.rs");
+    println!("cargo:rerun-if-changed=../sandbox-daemon/src/lib.rs");
+
+    let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR not set");
+    let out_path = Path::new(&out_dir).join("openapi.json");
+
+    let openapi = ApiDoc::openapi();
+    let json = serde_json::to_string_pretty(&openapi)
+        .expect("Failed to serialize OpenAPI spec");
+
+    fs::write(&out_path, json).expect("Failed to write OpenAPI spec");
+    println!("cargo:warning=Generated OpenAPI spec at {}", out_path.display());
+}

engine/packages/openapi-gen/src/lib.rs

@@ -0,0 +1,3 @@
+//! Generated OpenAPI schema output.
+
+pub const OPENAPI_JSON: &str = include_str!(concat!(env!("OUT_DIR"), "/openapi.json"));