♻️ 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/@shikijs/langs/dist/angular-let-declaration.mjs

@@ -1,8 +0,0 @@
-import angular_expression from './angular-expression.mjs'
-
-const lang = Object.freeze(JSON.parse("{\"injectTo\":[\"text.html.derivative\",\"text.html.derivative.ng\",\"source.ts.ng\"],\"injectionSelector\":\"L:text.html -comment -expression.ng -meta.tag -source.css -source.js\",\"name\":\"angular-let-declaration\",\"patterns\":[{\"include\":\"#letDeclaration\"}],\"repository\":{\"letDeclaration\":{\"begin\":\"(@let)\\\\s+([$_[:alpha:]][$_[:alnum:]]*)\\\\s*(=)?\",\"beginCaptures\":{\"1\":{\"name\":\"storage.type.ng\"},\"2\":{\"name\":\"variable.other.constant.ng\"},\"3\":{\"name\":\"keyword.operator.assignment.ng\"}},\"end\":\"(?<=;)\",\"name\":\"meta.definition.variable.ng\",\"patterns\":[{\"include\":\"#letInitializer\"}]},\"letInitializer\":{\"begin\":\"\\\\s*\",\"beginCaptures\":{\"0\":{\"name\":\"keyword.operator.assignment.ng\"}},\"contentName\":\"meta.definition.variable.initializer.ng\",\"end\":\";\",\"endCaptures\":{\"0\":{\"name\":\"punctuation.terminator.statement.ng\"}},\"patterns\":[{\"include\":\"expression.ng\"}]}},\"scopeName\":\"template.let.ng\",\"embeddedLangs\":[\"angular-expression\"]}"))
-
-export default [
-...angular_expression,
-lang
-]