♻️ Restructure: Move Astro to repository root

BREAKING CHANGE: Astro project is now at repository root
- Removed dealplustech-astro subdirectory
- Moved all Astro files to root
- Updated PostCSS config to .cjs
- Removed old Next.js files

✅ 11 pages built successfully
✅ Cookie consent banner included
✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/runtime/server/render/component.d.ts

@@ -1,11 +0,0 @@
-import type { RouteData, SSRResult } from '../../../types/public/internal.js';
-import { type RenderInstance } from './common.js';
-import { type ComponentSlots } from './slot.js';
-declare const needsHeadRenderingSymbol: unique symbol;
-export declare function renderComponent(result: SSRResult, displayName: string, Component: unknown, props: Record<string | number, any>, slots?: ComponentSlots): RenderInstance | Promise<RenderInstance>;
-export declare function renderComponentToString(result: SSRResult, displayName: string, Component: unknown, props: Record<string | number, any>, slots?: any, isPage?: boolean, route?: RouteData): Promise<string>;
-export type NonAstroPageComponent = {
-    name: string;
-    [needsHeadRenderingSymbol]: boolean;
-};
-export {};