fix: use jsonc-parser in config merge and make updater reliably restart all services

merge-config.cjs loaded json5 (not installed, and unable to parse JSONC
comments), so sync_configs crashed mid-update and do_restart never ran —
leaving the emulator running the old JAR.

- merge-config.cjs: switch from json5 to jsonc-parser (already a
  dependency) to parse .jsonc configs including comments
- update-Nitrov3.sh: always run renderer/client parallel builds instead
  of gating them on the emulator's update status
- update-Nitrov3.sh: isolate each repo's yarn cache (--cache-folder) so
  parallel installs can't corrupt a shared cache and silently drop
  vite/pixi.js; replace invalid --no-cache flag with per-repo cache reset
- update-Nitrov3.sh: fix misleading [DRY-RUN] label on real updates

scripts/merge-config.cjs

@@ -1,5 +1,5 @@
 const fs = require("node:fs");
-const JSON5 = require("json5");
+const { parse, printParseErrorCode } = require("jsonc-parser");
 
 const exampleFile = process.argv[2];
 const targetFile = process.argv[3];
@@ -26,28 +26,47 @@ function deepMerge(target, source) {
 	return result;
 }
 
+function parseJsonc(file) {
+	if (!fs.existsSync(file)) {
+		return undefined;
+	}
+	const content = fs.readFileSync(file, "utf-8");
+	const errors = [];
+	const value = parse(content, errors, {
+		allowTrailingComma: true,
+		allowEmptyContent: true,
+	});
+	if (errors.length > 0) {
+		console.error(
+			`[merge-config] parse error in ${file}: ${errors
+				.map((e) => printParseErrorCode(e.error))
+				.join(", ")}`,
+		);
+		return undefined;
+	}
+	return value;
+}
+
 let example;
 try {
-	const content = fs.readFileSync(exampleFile, "utf-8");
-	example = JSON5.parse(content);
+	example = parseJsonc(exampleFile);
 } catch {
 	process.exit(1);
 }
 
+if (example === undefined) {
+	process.exit(1);
+}
+
 let current = {};
 try {
-	if (fs.existsSync(targetFile)) {
-		const content = fs.readFileSync(targetFile, "utf-8");
-		current = JSON5.parse(content);
+	const parsed = parseJsonc(targetFile);
+	if (parsed !== undefined && parsed !== null) {
+		current = parsed;
 	}
 } catch {
 	current = {};
 }
 
 const merged = deepMerge(current, example);
-
-const isJson5 = targetFile.endsWith(".json5");
-const output = isJson5
-	? JSON5.stringify(merged, null, 4)
-	: JSON.stringify(merged, null, 4);
-fs.writeFileSync(targetFile, `${output}\n`);
+fs.writeFileSync(targetFile, `${JSON.stringify(merged, null, 4)}\n`);