♻️ 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

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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/@rollup/rollup-darwin-arm64/package.json

@@ -1,22 +0,0 @@
-{
-  "name": "@rollup/rollup-darwin-arm64",
-  "version": "4.59.0",
-  "os": [
-    "darwin"
-  ],
-  "cpu": [
-    "arm64"
-  ],
-  "files": [
-    "rollup.darwin-arm64.node"
-  ],
-  "description": "Native bindings for Rollup",
-  "author": "Lukas Taegert-Atkinson",
-  "homepage": "https://rollupjs.org/",
-  "license": "MIT",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/rollup/rollup.git"
-  },
-  "main": "./rollup.darwin-arm64.node"
-}