♻️ 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/cli/flags.d.ts

@@ -1,11 +0,0 @@
-import type { Arguments } from 'yargs-parser';
-import { Logger } from '../core/logger/core.js';
-import type { AstroInlineConfig } from '../types/public/config.js';
-export type Flags = Arguments;
-/** @deprecated Use AstroConfigResolver instead */
-export declare function flagsToAstroInlineConfig(flags: Flags): AstroInlineConfig;
-/**
- * The `logging` is usually created from an `AstroInlineConfig`, but some flows like `add`
- * doesn't read the AstroConfig directly, so we create a `logging` object from the CLI flags instead.
- */
-export declare function createLoggerFromFlags(flags: Flags): Logger;