♻️ 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/@img/sharp-libvips-darwin-arm64/package.json

@@ -1,36 +0,0 @@
-{
-  "name": "@img/sharp-libvips-darwin-arm64",
-  "version": "1.2.4",
-  "description": "Prebuilt libvips and dependencies for use with sharp on macOS 64-bit ARM",
-  "author": "Lovell Fuller <npm@lovell.info>",
-  "homepage": "https://sharp.pixelplumbing.com",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/lovell/sharp-libvips.git",
-    "directory": "npm/darwin-arm64"
-  },
-  "license": "LGPL-3.0-or-later",
-  "funding": {
-    "url": "https://opencollective.com/libvips"
-  },
-  "preferUnplugged": true,
-  "publishConfig": {
-    "access": "public"
-  },
-  "files": [
-    "lib",
-    "versions.json"
-  ],
-  "type": "commonjs",
-  "exports": {
-    "./lib": "./lib/index.js",
-    "./package": "./package.json",
-    "./versions": "./versions.json"
-  },
-  "os": [
-    "darwin"
-  ],
-  "cpu": [
-    "arm64"
-  ]
-}