♻️ 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/flattie/dist/index.mjs

@@ -1,25 +0,0 @@
-function iter(output, nullish, sep, val, key) {
-	var k, pfx = key ? (key + sep) : key;
-
-	if (val == null) {
-		if (nullish) output[key] = val;
-	} else if (typeof val != 'object') {
-		output[key] = val;
-	} else if (Array.isArray(val)) {
-		for (k=0; k < val.length; k++) {
-			iter(output, nullish, sep, val[k], pfx + k);
-		}
-	} else {
-		for (k in val) {
-			iter(output, nullish, sep, val[k], pfx + k);
-		}
-	}
-}
-
-export function flattie(input, glue, toNull) {
-	var output = {};
-	if (typeof input == 'object') {
-		iter(output, !!toNull, glue || '.', input, '');
-	}
-	return output;
-}