Refactor NodeCG runtime preparation and update handling

- Updated paths and configurations in doctor.mjs and prepare-nodecg-runtime.mjs to use new build-config.mjs imports.
- Enhanced runtime installation checks and permissions validation.
- Introduced new update configuration management in update-config.ts, including loading and validating update settings.
- Implemented update service for managing update checks and downloads in update-service.ts.
- Replaced update-utils.ts with update-schema.ts for better structure and clarity in update handling.
- Added comprehensive tests for update download and settings management.
- Ensured secure handling of download URLs and improved error handling in update processes.

src/main/nodecg/runtime-provisioner.ts

@@ -1,6 +1,8 @@
 import fs from "node:fs";
 import path from "node:path";
 
+import { getManagedNodecgRuntimePath } from "../app/paths";
+
 type RuntimeProvisionerConfig = {
   sourceRuntimePath: string;
   userDataPath: string;
@@ -55,7 +57,7 @@ export function prepareUserNodecgRuntime({
   deps,
 }: RuntimeProvisionerConfig): PreparedNodecgRuntime {
   const resolvedDeps = resolveDeps(deps);
-  const targetRuntimePath = path.join(userDataPath, "nodecg");
+  const targetRuntimePath = getManagedNodecgRuntimePath(userDataPath);
 
   validateSourceRuntime(sourceRuntimePath, bundleName, resolvedDeps.existsSync);
   resolvedDeps.mkdirSync(targetRuntimePath, { recursive: true });