refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/astro/dist/integrations/features-validation.d.ts

@@ -0,0 +1,23 @@
+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 {};