♻️ 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/postcss/lib/postcss.d.mts

@@ -1,69 +0,0 @@
-export {
-  // Type-only exports
-  AcceptedPlugin,
-
-  AnyNode,
-  atRule,
-  AtRule,
-  AtRuleProps,
-  Builder,
-  ChildNode,
-  ChildProps,
-  comment,
-  Comment,
-  CommentProps,
-  Container,
-  ContainerProps,
-  CssSyntaxError,
-  decl,
-  Declaration,
-  DeclarationProps,
-  // postcss function / namespace
-  default,
-  document,
-  Document,
-  DocumentProps,
-  FilePosition,
-  fromJSON,
-  Helpers,
-  Input,
-
-  JSONHydrator,
-  // This is a class, but it’s not re-exported. That’s why it’s exported as type-only here.
-  type LazyResult,
-  list,
-  Message,
-  Node,
-  NodeErrorOptions,
-  NodeProps,
-  OldPlugin,
-  parse,
-  Parser,
-  // @ts-expect-error This value exists, but it’s untyped.
-  plugin,
-  Plugin,
-  PluginCreator,
-  Position,
-  Postcss,
-  ProcessOptions,
-  Processor,
-  Result,
-  root,
-  Root,
-  RootProps,
-  rule,
-  Rule,
-  RuleProps,
-  Source,
-  SourceMap,
-  SourceMapOptions,
-  Stringifier,
-  // Value exports from postcss.mjs
-  stringify,
-  Syntax,
-  TransformCallback,
-  Transformer,
-  Warning,
-
-  WarningOptions
-} from './postcss.js'