♻️ 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/property-information/lib/util/merge.js

@@ -1,27 +0,0 @@
-/**
- * @import {Info, Space} from 'property-information'
- */
-
-import {Schema} from './schema.js'
-
-/**
- * @param {ReadonlyArray<Schema>} definitions
- *   Definitions.
- * @param {Space | undefined} [space]
- *   Space.
- * @returns {Schema}
- *   Schema.
- */
-export function merge(definitions, space) {
-  /** @type {Record<string, Info>} */
-  const property = {}
-  /** @type {Record<string, string>} */
-  const normal = {}
-
-  for (const definition of definitions) {
-    Object.assign(property, definition.property)
-    Object.assign(normal, definition.normal)
-  }
-
-  return new Schema(property, normal, space)
-}