♻️ 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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✅ Ready for Easypanel deployment (no root dir needed)

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

dealplustech-astro/node_modules/astro/dist/runtime/client/dev-toolbar/settings.d.ts

@@ -1,21 +0,0 @@
-import { type Placement } from './ui-library/window.js';
-export interface Settings {
-    disableAppNotification: boolean;
-    verbose: boolean;
-    placement: Placement;
-}
-export declare const defaultSettings: {
-    disableAppNotification: false;
-    verbose: false;
-    placement: "bottom-center";
-};
-export declare const settings: {
-    readonly config: Settings;
-    updateSetting: <Key extends keyof Settings>(key: Key, value: Settings[Key]) => void;
-    logger: {
-        log: (message: string, level?: "log" | "warn" | "error") => void;
-        warn: (message: string) => void;
-        error: (message: string) => void;
-        verboseLog: (message: string) => void;
-    };
-};