♻️ 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/sync/index.d.ts

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

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

@@ -1,23 +0,0 @@
-import { printHelp } from "../../core/messages.js";
-import _sync from "../../core/sync/index.js";
-import { flagsToAstroInlineConfig } from "../flags.js";
-async function sync({ flags }) {
-  if (flags?.help || flags?.h) {
-    printHelp({
-      commandName: "astro sync",
-      usage: "[...flags]",
-      tables: {
-        Flags: [
-          ["--force", "Clear the content layer cache, forcing a full rebuild."],
-          ["--help (-h)", "See all available flags."]
-        ]
-      },
-      description: `Generates TypeScript types for all Astro modules.`
-    });
-    return 0;
-  }
-  await _sync(flagsToAstroInlineConfig(flags), { telemetry: true });
-}
-export {
-  sync
-};