♻️ 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/get-east-asian-width/utilities.js

@@ -1,24 +0,0 @@
-/**
-Binary search on a sorted flat array of [start, end] pairs.
-
-@param {number[]} ranges - Flat array of inclusive [start, end] range pairs, e.g. [0, 5, 10, 20].
-@param {number} codePoint - The value to search for.
-@returns {boolean} Whether the value falls within any of the ranges.
-*/
-export const isInRange = (ranges, codePoint) => {
-	let low = 0;
-	let high = Math.floor(ranges.length / 2) - 1;
-	while (low <= high) {
-		const mid = Math.floor((low + high) / 2);
-		const i = mid * 2;
-		if (codePoint < ranges[i]) {
-			high = mid - 1;
-		} else if (codePoint > ranges[i + 1]) {
-			low = mid + 1;
-		} else {
-			return true;
-		}
-	}
-
-	return false;
-};