♻️ 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/vite-plugin-astro/hmr.d.ts

@@ -1,10 +0,0 @@
-import type { HmrContext } from 'vite';
-import type { Logger } from '../core/logger/core.js';
-import type { CompileMetadata } from './types.js';
-interface HandleHotUpdateOptions {
-    logger: Logger;
-    astroFileToCompileMetadata: Map<string, CompileMetadata>;
-}
-export declare function handleHotUpdate(ctx: HmrContext, { logger, astroFileToCompileMetadata }: HandleHotUpdateOptions): Promise<import("vite").ModuleNode[] | undefined>;
-export declare function isStyleOnlyChanged(oldCode: string, newCode: string): boolean;
-export {};