♻️ 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
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✅ 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/server-islands.d.ts

@@ -1,24 +0,0 @@
-import type { SSRResult } from '../../../types/public/internal.js';
-import { type ThinHead } from './astro/head-and-content.js';
-import type { RenderDestination } from './common.js';
-import { type ComponentSlots } from './slot.js';
-export declare function containsServerDirective(props: Record<string | number, any>): boolean;
-export declare class ServerIslandComponent {
-    result: SSRResult;
-    props: Record<string | number, any>;
-    slots: ComponentSlots;
-    displayName: string;
-    hostId: string | undefined;
-    islandContent: string | undefined;
-    componentPath: string | undefined;
-    componentExport: string | undefined;
-    componentId: string | undefined;
-    constructor(result: SSRResult, props: Record<string | number, any>, slots: ComponentSlots, displayName: string);
-    init(): Promise<ThinHead>;
-    render(destination: RenderDestination): Promise<void>;
-    getComponentPath(): string;
-    getComponentExport(): string;
-    getHostId(): Promise<string>;
-    getIslandContent(): Promise<string>;
-}
-export declare const renderServerIslandRuntime: () => string;