♻️ 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/astro/dist/env/config.js

@@ -1,21 +0,0 @@
-const envField = {
-  string: (options) => ({
-    ...options,
-    type: "string"
-  }),
-  number: (options) => ({
-    ...options,
-    type: "number"
-  }),
-  boolean: (options) => ({
-    ...options,
-    type: "boolean"
-  }),
-  enum: (options) => ({
-    ...options,
-    type: "enum"
-  })
-};
-export {
-  envField
-};