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/assets/utils/resolveImports.d.ts

@@ -0,0 +1,9 @@
+/**
+ * Resolves an image src from a content file (such as markdown) to a module ID or import that can be resolved by Vite.
+ *
+ * @param imageSrc The src attribute of an image tag
+ * @param filePath The path to the file that contains the imagem relative to the site root
+ * @returns A module id of the image that can be rsolved by Vite, or undefined if it is not a local image
+ */
+export declare function imageSrcToImportId(imageSrc: string, filePath?: string): string | undefined;
+export declare const importIdToSymbolName: (importId: string) => string;