♻️ 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/regex/src/flag-n.js

@@ -1,49 +0,0 @@
-import {getEndContextForIncompleteExpression, RegexContext} from './utils.js';
-import {noncapturingDelim} from './utils-internals.js';
-/**
-@import {Preprocessor} from './utils.js';
-*/
-
-const token = new RegExp(String.raw`
-${noncapturingDelim}
-| \(\?<
-| (?<backrefNum>\\[1-9]\d*)
-| \\?.
-`.replace(/\s+/g, ''), 'gsu');
-
-/**
-Apply transformations for flag n (named capture only).
-
-Preprocessors are applied to the outer regex and interpolated patterns, but not interpolated
-regexes or strings.
-@type {Preprocessor}
-*/
-function flagNPreprocessor(value, runningContext) {
-  value = String(value);
-  let expression = '';
-  let transformed = '';
-  for (const {0: m, groups: {backrefNum}} of value.matchAll(token)) {
-    expression += m;
-    runningContext = getEndContextForIncompleteExpression(expression, runningContext);
-    const {regexContext} = runningContext;
-    if (regexContext === RegexContext.DEFAULT) {
-      if (m === '(') {
-        transformed += '(?:';
-      } else if (backrefNum) {
-        throw new Error(`Invalid decimal escape "${m}" with implicit flag n; replace with named backreference`);
-      } else {
-        transformed += m;
-      }
-    } else {
-      transformed += m;
-    }
-  }
-  return {
-    transformed,
-    runningContext,
-  };
-}
-
-export {
-  flagNPreprocessor,
-};