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

nginx.conf

@@ -1,19 +1,38 @@
 server {
     listen 80;
-    server_name apps.local;
+    server_name apps.local admin.apps.local;
     
     root /usr/share/nginx/html;
-    index index.html;
+    index index.html admin.html;
     
     location / {
         try_files $uri $uri/ /index.html;
     }
     
+    location /admin {
+        alias /usr/share/nginx/html;
+        try_files $uri $uri/ /admin.html;
+    }
+    
+    location /admin/ {
+        alias /usr/share/nginx/html;
+        try_files $uri $uri/ /admin.html;
+    }
+    
     location /apps.json {
         add_header Content-Type application/json;
         add_header Access-Control-Allow-Origin *;
     }
     
+    location /api {
+        proxy_pass http://localhost:3000/api;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+    }
+    
     gzip on;
     gzip_vary on;
     gzip_min_length 1024;