♻️ 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/@astrojs/compiler/dist/node/utils.d.ts

@@ -1,29 +0,0 @@
-import { Node, ParentNode, LiteralNode, TagLikeNode, TextNode, RootNode, ElementNode, CustomElementNode, ComponentNode, FragmentNode, ExpressionNode, DoctypeNode, CommentNode, FrontmatterNode } from '../shared/ast.js';
-
-type Visitor = (node: Node, parent?: ParentNode, index?: number) => void | Promise<void>;
-declare const is: {
-    parent(node: Node): node is ParentNode;
-    literal(node: Node): node is LiteralNode;
-    tag(node: Node): node is TagLikeNode;
-    whitespace(node: Node): node is TextNode;
-    root: (node: Node) => node is RootNode;
-    element: (node: Node) => node is ElementNode;
-    customElement: (node: Node) => node is CustomElementNode;
-    component: (node: Node) => node is ComponentNode;
-    fragment: (node: Node) => node is FragmentNode;
-    expression: (node: Node) => node is ExpressionNode;
-    text: (node: Node) => node is TextNode;
-    doctype: (node: Node) => node is DoctypeNode;
-    comment: (node: Node) => node is CommentNode;
-    frontmatter: (node: Node) => node is FrontmatterNode;
-};
-declare function walk(node: ParentNode, callback: Visitor): void;
-declare function walkAsync(node: ParentNode, callback: Visitor): Promise<void>;
-interface SerializeOptions {
-    selfClose: boolean;
-}
-/** @deprecated Please use `SerializeOptions`  */
-type SerializeOtions = SerializeOptions;
-declare function serialize(root: Node, opts?: SerializeOptions): string;
-
-export { SerializeOptions, SerializeOtions, Visitor, is, serialize, walk, walkAsync };