♻️ 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
✅ Cookie consent banner included
✅ 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/prismjs/components/prism-supercollider.min.js

@@ -1 +0,0 @@
-Prism.languages.supercollider={comment:{pattern:/\/\/.*|\/\*(?:[^*/]|\*(?!\/)|\/(?!\*)|\/\*(?:[^*]|\*(?!\/))*\*\/)*\*\//,greedy:!0},string:{pattern:/(^|[^\\])"(?:[^"\\]|\\[\s\S])*"/,lookbehind:!0,greedy:!0},char:{pattern:/\$(?:[^\\\r\n]|\\.)/,greedy:!0},symbol:{pattern:/(^|[^\\])'(?:[^'\\]|\\[\s\S])*'|\\\w+/,lookbehind:!0,greedy:!0},keyword:/\b(?:_|arg|classvar|const|nil|var|while)\b/,boolean:/\b(?:false|true)\b/,label:{pattern:/\b[a-z_]\w*(?=\s*:)/,alias:"property"},number:/\b(?:inf|pi|0x[0-9a-fA-F]+|\d+(?:\.\d+)?(?:[eE][+-]?\d+)?(?:pi)?|\d+r[0-9a-zA-Z]+(?:\.[0-9a-zA-Z]+)?|\d+[sb]{1,4}\d*)\b/,"class-name":/\b[A-Z]\w*\b/,operator:/\.{2,3}|#(?![[{])|&&|[!=]==?|\+>>|\+{1,3}|-[->]|=>|>>|\?\?|@\|?@|\|(?:@|[!=]=)?\||!\?|<[!=>]|\*{1,2}|<{2,3}\*?|[-!%&/<>?@|=`]/,punctuation:/[{}()[\].:,;]|#[[{]/},Prism.languages.sclang=Prism.languages.supercollider;