♻️ 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/zod-to-json-schema/dist/cjs/parsers/undefined.js

@@ -1,10 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-exports.parseUndefinedDef = void 0;
-const any_js_1 = require("./any.js");
-function parseUndefinedDef(refs) {
-    return {
-        not: (0, any_js_1.parseAnyDef)(refs),
-    };
-}
-exports.parseUndefinedDef = parseUndefinedDef;