♻️ 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/prismjs/components/prism-oz.min.js

@@ -1 +0,0 @@
-Prism.languages.oz={comment:{pattern:/\/\*[\s\S]*?\*\/|%.*/,greedy:!0},string:{pattern:/"(?:[^"\\]|\\[\s\S])*"/,greedy:!0},atom:{pattern:/'(?:[^'\\]|\\[\s\S])*'/,greedy:!0,alias:"builtin"},keyword:/\$|\[\]|\b(?:_|at|attr|case|catch|choice|class|cond|declare|define|dis|else(?:case|if)?|end|export|fail|false|feat|finally|from|fun|functor|if|import|in|local|lock|meth|nil|not|of|or|prepare|proc|prop|raise|require|self|skip|then|thread|true|try|unit)\b/,function:[/\b[a-z][A-Za-z\d]*(?=\()/,{pattern:/(\{)[A-Z][A-Za-z\d]*\b/,lookbehind:!0}],number:/\b(?:0[bx][\da-f]+|\d+(?:\.\d*)?(?:e~?\d+)?)\b|&(?:[^\\]|\\(?:\d{3}|.))/i,variable:/`(?:[^`\\]|\\.)+`/,"attr-name":/\b\w+(?=[ \t]*:(?![:=]))/,operator:/:(?:=|::?)|<[-:=]?|=(?:=|<?:?)|>=?:?|\\=:?|!!?|[|#+\-*\/,~^@]|\b(?:andthen|div|mod|orelse)\b/,punctuation:/[\[\](){}.:;?]/};