♻️ 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-bro.min.js

@@ -1 +0,0 @@
-Prism.languages.bro={comment:{pattern:/(^|[^\\$])#.*/,lookbehind:!0,inside:{italic:/\b(?:FIXME|TODO|XXX)\b/}},string:{pattern:/(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,greedy:!0},boolean:/\b[TF]\b/,function:{pattern:/(\b(?:event|function|hook)[ \t]+)\w+(?:::\w+)?/,lookbehind:!0},builtin:/(?:@(?:load(?:-(?:plugin|sigs))?|unload|prefixes|ifn?def|else|(?:end)?if|DIR|FILENAME))|(?:&?(?:add_func|create_expire|default|delete_func|encrypt|error_handler|expire_func|group|log|mergeable|optional|persistent|priority|raw_output|read_expire|redef|rotate_interval|rotate_size|synchronized|type_column|write_expire))/,constant:{pattern:/(\bconst[ \t]+)\w+/i,lookbehind:!0},keyword:/\b(?:add|addr|alarm|any|bool|break|const|continue|count|delete|double|else|enum|event|export|file|for|function|global|hook|if|in|int|interval|local|module|next|of|opaque|pattern|port|print|record|return|schedule|set|string|subnet|table|time|timeout|using|vector|when)\b/,operator:/--?|\+\+?|!=?=?|<=?|>=?|==?=?|&&|\|\|?|\?|\*|\/|~|\^|%/,number:/\b0x[\da-f]+\b|(?:\b\d+(?:\.\d*)?|\B\.\d+)(?:e[+-]?\d+)?/i,punctuation:/[{}[\];(),.:]/};