refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

easypanel.config.json

@@ -0,0 +1,16 @@
+{
+  "easypanel": {
+    "url": "",
+    "project": "customerwebsite",
+    "app": {
+      "name": "dealplustech-astro",
+      "port": 4321,
+      "image": "dealplustech-astro:latest"
+    },
+    "env": {
+      "NODE_ENV": "production",
+      "PORT": "4321",
+      "HOST": "0.0.0.0"
+    }
+  }
+}