♻️ 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

✅ 11 pages built successfully
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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/@shikijs/engine-oniguruma/package.json

@@ -1,42 +0,0 @@
-{
-  "name": "@shikijs/engine-oniguruma",
-  "type": "module",
-  "version": "3.23.0",
-  "description": "Engine for Shiki using Oniguruma RegExp engine in WebAssembly",
-  "author": "Anthony Fu <anthonyfu117@hotmail.com>",
-  "license": "MIT",
-  "homepage": "https://github.com/shikijs/shiki#readme",
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/shikijs/shiki.git",
-    "directory": "packages/engine-oniguruma"
-  },
-  "bugs": "https://github.com/shikijs/shiki/issues",
-  "keywords": [
-    "shiki",
-    "shiki-engine",
-    "oniguruma"
-  ],
-  "sideEffects": false,
-  "exports": {
-    ".": "./dist/index.mjs",
-    "./wasm-inlined": "./dist/wasm-inlined.mjs"
-  },
-  "main": "./dist/index.mjs",
-  "module": "./dist/index.mjs",
-  "types": "./dist/index.d.mts",
-  "files": [
-    "dist"
-  ],
-  "dependencies": {
-    "@shikijs/vscode-textmate": "^10.0.2",
-    "@shikijs/types": "3.23.0"
-  },
-  "devDependencies": {
-    "vscode-oniguruma": "1.7.0"
-  },
-  "scripts": {
-    "build": "rimraf dist && rollup -c",
-    "dev": "rollup -cw"
-  }
-}