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

@@ -1,30 +0,0 @@
-{
-  "aom": "3.13.1",
-  "archive": "3.8.2",
-  "cairo": "1.18.4",
-  "cgif": "0.5.0",
-  "exif": "0.6.25",
-  "expat": "2.7.3",
-  "ffi": "3.5.2",
-  "fontconfig": "2.17.1",
-  "freetype": "2.14.1",
-  "fribidi": "1.0.16",
-  "glib": "2.86.1",
-  "harfbuzz": "12.1.0",
-  "heif": "1.20.2",
-  "highway": "1.3.0",
-  "imagequant": "2.4.1",
-  "lcms": "2.17",
-  "mozjpeg": "0826579",
-  "pango": "1.57.0",
-  "pixman": "0.46.4",
-  "png": "1.6.50",
-  "proxy-libintl": "0.5",
-  "rsvg": "2.61.2",
-  "spng": "0.7.4",
-  "tiff": "4.7.1",
-  "vips": "8.17.3",
-  "webp": "1.6.0",
-  "xml2": "2.15.1",
-  "zlib-ng": "2.2.5"
-}