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/runtime/client/dev-toolbar/ui-library/window.d.ts

@@ -0,0 +1,14 @@
+export declare const placements: readonly ["bottom-left", "bottom-center", "bottom-right"];
+export type Placement = (typeof placements)[number];
+export declare function isValidPlacement(value: string): value is Placement;
+export declare class DevToolbarWindow extends HTMLElement {
+    shadowRoot: ShadowRoot;
+    _placement: Placement;
+    get placement(): "bottom-left" | "bottom-center" | "bottom-right";
+    set placement(value: "bottom-left" | "bottom-center" | "bottom-right");
+    static observedAttributes: string[];
+    constructor();
+    connectedCallback(): Promise<void>;
+    attributeChangedCallback(): void;
+    updateStyle(): void;
+}