Add admin panel API with CRUD for apps

- Express.js backend with JWT authentication
- CRUD endpoints for apps management
- Health check endpoint
- Dockerfile per admin API (Node 18 Alpine)
- Kubernetes: admin-api deployment, service, ingress
- Admin panel at http://admin.apps.local
- Updated nginx.conf to route /api to admin API
- Fixed ingress rules for separate web and admin services

backend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "linux-app-store-admin",
+  "version": "1.0.0",
+  "description": "Admin panel API for Linux App Store",
+  "main": "server.js",
+  "scripts": {
+    "start": "node server.js",
+    "dev": "node --watch server.js"
+  },
+  "dependencies": {
+    "express": "^4.18.2",
+    "express-jwt": "^8.4.1",
+    "jsonwebtoken": "^9.0.2",
+    "cors": "^2.8.5"
+  }
+}