♻️ 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/runtime/server/render/instruction.d.ts

@@ -1,31 +0,0 @@
-import type { HydrationMetadata } from '../hydration.js';
-export type RenderDirectiveInstruction = {
-    type: 'directive';
-    hydration: HydrationMetadata;
-};
-export type RenderHeadInstruction = {
-    type: 'head';
-};
-/**
- * Render a renderer-specific hydration script before the first component of that
- * framework
- */
-export type RendererHydrationScriptInstruction = {
-    type: 'renderer-hydration-script';
-    rendererName: string;
-    render: () => string;
-};
-export type MaybeRenderHeadInstruction = {
-    type: 'maybe-head';
-};
-export type ServerIslandRuntimeInstruction = {
-    type: 'server-island-runtime';
-};
-export type RenderScriptInstruction = {
-    type: 'script';
-    id: string;
-    content: string;
-};
-export type RenderInstruction = RenderDirectiveInstruction | RenderHeadInstruction | MaybeRenderHeadInstruction | RendererHydrationScriptInstruction | ServerIslandRuntimeInstruction | RenderScriptInstruction;
-export declare function createRenderInstruction<T extends RenderInstruction>(instruction: T): T;
-export declare function isRenderInstruction(chunk: any): chunk is RenderInstruction;