♻️ 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/integrations/features-validation.d.ts

@@ -1,23 +0,0 @@
-import type { Logger } from '../core/logger/core.js';
-import type { AstroSettings } from '../types/astro.js';
-import type { AstroAdapterFeatureMap } from '../types/public/integrations.js';
-export declare const AdapterFeatureStability: {
-    readonly STABLE: "stable";
-    readonly DEPRECATED: "deprecated";
-    readonly UNSUPPORTED: "unsupported";
-    readonly EXPERIMENTAL: "experimental";
-    readonly LIMITED: "limited";
-};
-type ValidationResult = {
-    [Property in keyof AstroAdapterFeatureMap]: boolean;
-};
-/**
- * Checks whether an adapter supports certain features that are enabled via Astro configuration.
- *
- * If a configuration is enabled and "unlocks" a feature, but the adapter doesn't support, the function
- * will throw a runtime error.
- *
- */
-export declare function validateSupportedFeatures(adapterName: string, featureMap: AstroAdapterFeatureMap, settings: AstroSettings, logger: Logger): ValidationResult;
-export declare function getAdapterStaticRecommendation(adapterName: string): string | undefined;
-export {};