♻️ 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/astro/dist/vite-plugin-astro-postprocess/index.d.ts

@@ -1,2 +0,0 @@
-import type { Plugin } from 'vite';
-export default function astro(): Plugin;

dealplustech-astro/node_modules/astro/dist/vite-plugin-astro-postprocess/index.js

@@ -1,48 +0,0 @@
-import { parse } from "acorn";
-import { walk } from "estree-walker";
-import MagicString from "magic-string";
-import { isMarkdownFile } from "../core/util.js";
-const ASTRO_GLOB_REGEX = /Astro2?\s*\.\s*glob\s*\(/;
-function astro() {
-  return {
-    name: "astro:postprocess",
-    async transform(code, id) {
-      if (!id.endsWith(".astro") && !isMarkdownFile(id)) {
-        return null;
-      }
-      if (!ASTRO_GLOB_REGEX.test(code)) {
-        return null;
-      }
-      let s;
-      const ast = parse(code, {
-        ecmaVersion: "latest",
-        sourceType: "module"
-      });
-      walk(ast, {
-        enter(node) {
-          if (node.type === "CallExpression" && node.callee.type === "MemberExpression" && node.callee.property.name === "glob" && (node.callee.object.name === "Astro" || node.callee.object.name === "Astro2") && node.arguments.length) {
-            const firstArgStart = node.arguments[0].start;
-            const firstArgEnd = node.arguments[0].end;
-            const lastArgEnd = node.arguments[node.arguments.length - 1].end;
-            const firstArg = code.slice(firstArgStart, firstArgEnd);
-            s ??= new MagicString(code);
-            s.overwrite(
-              firstArgStart,
-              lastArgEnd,
-              `import.meta.glob(${firstArg}), () => ${firstArg}`
-            );
-          }
-        }
-      });
-      if (s) {
-        return {
-          code: s.toString(),
-          map: s.generateMap({ hires: "boundary" })
-        };
-      }
-    }
-  };
-}
-export {
-  astro as default
-};