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

node_modules/astro/dist/preferences/defaults.d.ts

@@ -0,0 +1,16 @@
+export declare const DEFAULT_PREFERENCES: {
+    devToolbar: {
+        /** Specifies whether the user has the Dev Overlay enabled */
+        enabled: boolean;
+    };
+    checkUpdates: {
+        /** Specifies whether the user has the update check enabled */
+        enabled: boolean;
+    };
+    _variables: {
+        /** Time since last update check */
+        lastUpdateCheck: number;
+    };
+};
+export type Preferences = typeof DEFAULT_PREFERENCES;
+export type PublicPreferences = Omit<Preferences, '_variables'>;