♻️ 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/package.json

@@ -1,25 +0,0 @@
-{
-  "name": "dealplustech-astro",
-  "type": "module",
-  "version": "0.0.1",
-  "scripts": {
-    "dev": "astro dev",
-    "build": "astro build",
-    "preview": "astro preview",
-    "astro": "astro",
-    "db:push": "astro db push",
-    "db:seed": "astro db seed"
-  },
-  "dependencies": {
-    "@astrojs/node": "^9.5.4",
-    "@libsql/client": "^0.17.0",
-    "@tailwindcss/vite": "^4.2.1",
-    "astro": "^5.17.1",
-    "astro-consent": "^1.0.17",
-    "drizzle-orm": "^0.45.1",
-    "tailwindcss": "^4.2.1"
-  },
-  "devDependencies": {
-    "@astrojs/db": "^0.19.0"
-  }
-}