fix: add missing @objectstack/core dependency and fix type assertion in examples/basic

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

examples/basic/logger-example.ts

@@ -182,7 +182,7 @@ async function examplePluginLogging() {
     dependencies: ['database'],
 
     init: async (ctx: PluginContext) => {
-      const db = ctx.getService('db');
+      const db = ctx.getService('db') as { connected: boolean };
       ctx.logger.info('API plugin initialized', { dbConnected: db.connected });
 
       ctx.registerService('api', { server: 'http://localhost:3000' });

examples/basic/package.json

@@ -9,7 +9,8 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@objectstack/spec": "workspace:*"
+    "@objectstack/spec": "workspace:*",
+    "@objectstack/core": "workspace:*"
   },
   "devDependencies": {
     "typescript": "^5.0.0",