♻️ 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/deterministic-object-hash/dist/isPlainObject.js

@@ -1,27 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-const objConstructorString = Function.prototype.toString.call(Object);
-function isPlainObject(value) {
-    //base object
-    if (typeof value !== 'object' ||
-        value === null ||
-        Object.prototype.toString.call(value) !== '[object Object]') {
-        return false;
-    }
-    //get the prototype
-    const proto = Object.getPrototypeOf(value);
-    //no prototype === all good
-    if (proto === null) {
-        return true;
-    }
-    //has own prop 'constructor'
-    if (!Object.prototype.hasOwnProperty.call(proto, 'constructor')) {
-        return false;
-    }
-    // validate that the constructor is `Object`
-    return (typeof proto.constructor === 'function' &&
-        proto.constructor instanceof proto.constructor &&
-        Function.prototype.toString.call(proto.constructor) === objConstructorString);
-}
-exports.default = isPlainObject;
-;