♻️ 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/sisteransi/src/sisteransi.d.ts

@@ -1,35 +0,0 @@
-export const beep: string;
-export const clear: string;
-
-export namespace cursor {
-    export const left: string;
-    export const hide: string;
-    export const show: string;
-    export const save: string;
-    export const restore: string;
-
-    export function to(x: number, y?: number): string;
-    export function move(x: number, y: number): string;
-    export function up(count?: number): string;
-    export function down(count?: number): string;
-    export function forward(count?: number): string;
-    export function backward(count?: number): string;
-    export function nextLine(count?: number): string;
-    export function prevLine(count?: number): string;
-}
-
-export namespace scroll {
-    export function up(count?: number): string;
-    export function down(count?: number): string;
-}
-
-export namespace erase {
-    export const screen: string;
-    export const line: string;
-    export const lineEnd: string;
-    export const lineStart: string;
-
-    export function up(count?: number): string;
-    export function down(count?: number): string;
-    export function lines(count: number): string;
-}