♻️ 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-tap.min.js

@@ -1 +0,0 @@
-Prism.languages.tap={fail:/not ok[^#{\n\r]*/,pass:/ok[^#{\n\r]*/,pragma:/pragma [+-][a-z]+/,bailout:/bail out!.*/i,version:/TAP version \d+/i,plan:/\b\d+\.\.\d+(?: +#.*)?/,subtest:{pattern:/# Subtest(?:: .*)?/,greedy:!0},punctuation:/[{}]/,directive:/#.*/,yamlish:{pattern:/(^[ \t]*)---[\s\S]*?[\r\n][ \t]*\.\.\.$/m,lookbehind:!0,inside:Prism.languages.yaml,alias:"language-yaml"}};