♻️ 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
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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/oniguruma-to-es/dist/cjs/generate.d.ts

@@ -1,27 +0,0 @@
-/**
-@import {ToRegExpOptions} from './index.js';
-@import {RegexPlusAst} from './transform.js';
-@import {AlternativeNode, AssertionNode, BackreferenceNode, CapturingGroupNode, CharacterClassNode, CharacterClassRangeNode, CharacterNode, CharacterSetNode, FlagsNode, GroupNode, LookaroundAssertionNode, Node, QuantifierNode, SubroutineNode} from 'oniguruma-parser/parser';
-@import {Visitor} from 'oniguruma-parser/traverser';
-*/
-/**
-Generates a Regex+ compatible `pattern`, `flags`, and `options` from a Regex+ AST.
-@param {RegexPlusAst} ast
-@param {ToRegExpOptions} [options]
-@returns {{
-  pattern: string;
-  flags: string;
-  options: Object;
-  _captureTransfers: Map<number, Array<number>>;
-  _hiddenCaptures: Array<number>;
-}}
-*/
-export function generate(ast: RegexPlusAst, options?: ToRegExpOptions): {
-    pattern: string;
-    flags: string;
-    options: any;
-    _captureTransfers: Map<number, Array<number>>;
-    _hiddenCaptures: Array<number>;
-};
-import type { RegexPlusAst } from './transform.js';
-import type { ToRegExpOptions } from './index.js';