♻️ 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/check/index.d.ts

@@ -1,2 +0,0 @@
-import { type Flags } from '../flags.js';
-export declare function check(flags: Flags): Promise<boolean | void>;

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

@@ -1,37 +0,0 @@
-import path from "node:path";
-import { ensureProcessNodeEnv } from "../../core/util.js";
-import { createLoggerFromFlags, flagsToAstroInlineConfig } from "../flags.js";
-import { getPackage } from "../install-package.js";
-async function check(flags) {
-  ensureProcessNodeEnv("production");
-  const logger = createLoggerFromFlags(flags);
-  const getPackageOpts = {
-    skipAsk: !!flags.yes || !!flags.y,
-    cwd: flags.root
-  };
-  const checkPackage = await getPackage(
-    "@astrojs/check",
-    logger,
-    getPackageOpts,
-    ["typescript"]
-  );
-  const typescript = await getPackage("typescript", logger, getPackageOpts);
-  if (!checkPackage || !typescript) {
-    logger.error(
-      "check",
-      "The `@astrojs/check` and `typescript` packages are required for this command to work. Please manually install them into your project and try again."
-    );
-    return;
-  }
-  if (!flags.noSync && !flags.help) {
-    const { default: sync } = await import("../../core/sync/index.js");
-    await sync(flagsToAstroInlineConfig(flags));
-  }
-  const { check: checker, parseArgsAsCheckConfig } = checkPackage;
-  const config = parseArgsAsCheckConfig(process.argv);
-  logger.info("check", `Getting diagnostics for Astro files in ${path.resolve(config.root)}...`);
-  return await checker(config);
-}
-export {
-  check
-};