♻️ 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/db/index.d.ts

@@ -1,4 +0,0 @@
-import type { Arguments } from 'yargs-parser';
-export declare function db({ flags }: {
-    flags: Arguments;
-}): Promise<void>;

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

@@ -1,25 +0,0 @@
-import { resolveConfig } from "../../core/config/config.js";
-import { createLoggerFromFlags, flagsToAstroInlineConfig } from "../flags.js";
-import { getPackage } from "../install-package.js";
-async function db({ flags }) {
-  const logger = createLoggerFromFlags(flags);
-  const getPackageOpts = {
-    skipAsk: !!flags.yes || !!flags.y,
-    cwd: flags.root
-  };
-  const dbPackage = await getPackage("@astrojs/db", logger, getPackageOpts, []);
-  if (!dbPackage) {
-    logger.error(
-      "check",
-      "The `@astrojs/db` package is required for this command to work. Please manually install it in your project and try again."
-    );
-    return;
-  }
-  const { cli } = dbPackage;
-  const inlineConfig = flagsToAstroInlineConfig(flags);
-  const { astroConfig } = await resolveConfig(inlineConfig, "build");
-  await cli({ flags, config: astroConfig });
-}
-export {
-  db
-};