♻️ 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/preferences/store.d.ts

@@ -1,15 +0,0 @@
-export declare class PreferenceStore {
-    private dir;
-    private file;
-    constructor(dir: string, filename?: string);
-    private _store?;
-    private get store();
-    private set store(value);
-    write(): void;
-    clear(): void;
-    delete(key: string): boolean;
-    get(key: string): any;
-    has(key: string): boolean;
-    set(key: string, value: any): void;
-    getAll(): Record<string, any>;
-}