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/env/validators.d.ts

@@ -0,0 +1,15 @@
+import type { EnvFieldType } from './schema.js';
+export type ValidationResultValue = EnvFieldType['default'];
+export type ValidationResultErrors = ['missing'] | ['type'] | Array<string>;
+interface ValidationResultValid {
+    ok: true;
+    value: ValidationResultValue;
+}
+export interface ValidationResultInvalid {
+    ok: false;
+    errors: ValidationResultErrors;
+}
+type ValidationResult = ValidationResultValid | ValidationResultInvalid;
+export declare function getEnvFieldType(options: EnvFieldType): string;
+export declare function validateEnvVariable(value: string | undefined, options: EnvFieldType): ValidationResult;
+export {};