Add Node.js manager service and updated docker-compose

manager/src/core/config.ts

@@ -0,0 +1,30 @@
+import fs from "fs";
+import path from "path";
+import YAML from "yaml";
+
+export interface InstanceConfig {
+  id: string;
+  containerName: string;
+  image: string;
+  savedDir: string;
+  configPaths: {
+    serverDescription: string;
+    worldsRoot: string;
+  };
+}
+
+const CONFIG_PATH = path.join(__dirname, "..", "..", "config", "instances.yml");
+
+let cache: { instances: InstanceConfig[] };
+
+export function loadConfig() {
+  if (!cache) {
+    const raw = fs.readFileSync(CONFIG_PATH, "utf8");
+    cache = YAML.parse(raw);
+  }
+  return cache;
+}
+
+export function getInstance(id: string) {
+  return loadConfig().instances.find(i => i.id === id);
+}