♻️ 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/env/sync.js

@@ -1,33 +0,0 @@
-import { ENV_TYPES_FILE } from "./constants.js";
-import { getEnvFieldType } from "./validators.js";
-function syncAstroEnv(settings) {
-  let client = "";
-  let server = "";
-  for (const [key, options] of Object.entries(settings.config.env.schema)) {
-    const str = `	export const ${key}: ${getEnvFieldType(options)};	
-`;
-    if (options.context === "client") {
-      client += str;
-    } else {
-      server += str;
-    }
-  }
-  let content = "";
-  if (client !== "") {
-    content = `declare module 'astro:env/client' {
-${client}}`;
-  }
-  if (server !== "") {
-    content += `declare module 'astro:env/server' {
-${server}}`;
-  }
-  if (content !== "") {
-    settings.injectedTypes.push({
-      filename: ENV_TYPES_FILE,
-      content
-    });
-  }
-}
-export {
-  syncAstroEnv
-};