♻️ 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

✅ 11 pages built successfully
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✅ Privacy/Terms links in footer
✅ Ready for Easypanel deployment (no root dir needed)

Migration path:
- Old structure: /dealplustech-astro/
- New structure: / (root)

dealplustech-astro/node_modules/astro/dist/runtime/server/endpoint.d.ts

@@ -1,7 +0,0 @@
-import type { Logger } from '../../core/logger/core.js';
-import type { APIRoute } from '../../types/public/common.js';
-import type { APIContext } from '../../types/public/context.js';
-/** Renders an endpoint request to completion, returning the body. */
-export declare function renderEndpoint(mod: {
-    [method: string]: APIRoute;
-}, context: APIContext, isPrerendered: boolean, logger: Logger): Promise<Response>;