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/vite-plugin-astro-server/server-state.d.ts

@@ -0,0 +1,15 @@
+type ErrorState = 'fresh' | 'error';
+interface RouteState {
+    state: ErrorState;
+    error?: Error;
+}
+export interface ServerState {
+    routes: Map<string, RouteState>;
+    state: ErrorState;
+    error?: Error;
+}
+export declare function createServerState(): ServerState;
+export declare function setRouteError(serverState: ServerState, pathname: string, error: Error): void;
+export declare function setServerError(serverState: ServerState, error: Error): void;
+export declare function clearRouteError(serverState: ServerState, pathname: string): void;
+export {};