♻️ 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/is-wsl/index.js

@@ -1,36 +0,0 @@
-import process from 'node:process';
-import os from 'node:os';
-import fs from 'node:fs';
-import isInsideContainer from 'is-inside-container';
-
-const isWsl = () => {
-	if (process.platform !== 'linux') {
-		return false;
-	}
-
-	if (os.release().toLowerCase().includes('microsoft')) {
-		if (isInsideContainer()) {
-			return false;
-		}
-
-		return true;
-	}
-
-	try {
-		if (fs.readFileSync('/proc/version', 'utf8').toLowerCase().includes('microsoft')) {
-			return !isInsideContainer();
-		}
-	} catch {}
-
-	// Fallback for custom kernels: check WSL-specific paths.
-	if (
-		fs.existsSync('/proc/sys/fs/binfmt_misc/WSLInterop')
-		|| fs.existsSync('/run/WSL')
-	) {
-		return !isInsideContainer();
-	}
-
-	return false;
-};
-
-export default process.env.__IS_WSL_TEST__ ? isWsl : isWsl();