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/content/runtime-assets.d.ts

@@ -0,0 +1,11 @@
+import type { PluginContext } from 'rollup';
+import { z } from 'zod';
+export declare function createImage(pluginContext: PluginContext, shouldEmitFile: boolean, entryFilePath: string, experimentalSvgEnabled: boolean): () => z.ZodEffects<z.ZodString, z.ZodNever | {
+    ASTRO_ASSET: string;
+    src: string;
+    format: import("../assets/types.js").ImageInputFormat;
+    width: number;
+    height: number;
+    fsPath: string;
+    orientation?: number | undefined;
+}, string>;