♻️ 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

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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/compile.d.ts

@@ -1,14 +0,0 @@
-import { type ESBuildTransformResult } from 'vite';
-import { type CompileProps, type CompileResult } from '../core/compile/index.js';
-import type { Logger } from '../core/logger/core.js';
-import type { CompileMetadata } from './types.js';
-interface CompileAstroOption {
-    compileProps: CompileProps;
-    astroFileToCompileMetadata: Map<string, CompileMetadata>;
-    logger: Logger;
-}
-export interface CompileAstroResult extends Omit<CompileResult, 'map'> {
-    map: ESBuildTransformResult['map'];
-}
-export declare function compileAstro({ compileProps, astroFileToCompileMetadata, logger, }: CompileAstroOption): Promise<CompileAstroResult>;
-export {};