♻️ 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/cli/preview/index.d.ts

@@ -1,6 +0,0 @@
-import { type Flags } from '../flags.js';
-interface PreviewOptions {
-    flags: Flags;
-}
-export declare function preview({ flags }: PreviewOptions): Promise<import("../../index.js").PreviewServer | undefined>;
-export {};

dealplustech-astro/node_modules/astro/dist/cli/preview/index.js

@@ -1,34 +0,0 @@
-import colors from "piccolore";
-import { printHelp } from "../../core/messages.js";
-import previewServer from "../../core/preview/index.js";
-import { flagsToAstroInlineConfig } from "../flags.js";
-async function preview({ flags }) {
-  if (flags?.help || flags?.h) {
-    printHelp({
-      commandName: "astro preview",
-      usage: "[...flags]",
-      tables: {
-        Flags: [
-          ["--port", `Specify which port to run on. Defaults to 4321.`],
-          ["--host", `Listen on all addresses, including LAN and public addresses.`],
-          ["--host <custom-address>", `Expose on a network IP address at <custom-address>`],
-          ["--open", "Automatically open the app in the browser on server start"],
-          [
-            "--allowed-hosts",
-            "Specify a comma-separated list of allowed hosts or allow any hostname."
-          ],
-          ["--help (-h)", "See all available flags."]
-        ]
-      },
-      description: `Starts a local server to serve your static dist/ directory. Check ${colors.cyan(
-        "https://docs.astro.build/en/reference/cli-reference/#astro-preview"
-      )} for more information.`
-    });
-    return;
-  }
-  const inlineConfig = flagsToAstroInlineConfig(flags);
-  return await previewServer(inlineConfig);
-}
-export {
-  preview
-};