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/core/constants.js

@@ -0,0 +1,43 @@
+const ASTRO_VERSION = "5.18.0";
+const REROUTE_DIRECTIVE_HEADER = "X-Astro-Reroute";
+const REWRITE_DIRECTIVE_HEADER_KEY = "X-Astro-Rewrite";
+const REWRITE_DIRECTIVE_HEADER_VALUE = "yes";
+const NOOP_MIDDLEWARE_HEADER = "X-Astro-Noop";
+const ROUTE_TYPE_HEADER = "X-Astro-Route-Type";
+const DEFAULT_404_COMPONENT = "astro-default-404.astro";
+const REDIRECT_STATUS_CODES = [301, 302, 303, 307, 308, 300, 304];
+const REROUTABLE_STATUS_CODES = [404, 500];
+const clientAddressSymbol = Symbol.for("astro.clientAddress");
+const clientLocalsSymbol = Symbol.for("astro.locals");
+const originPathnameSymbol = Symbol.for("astro.originPathname");
+const nodeRequestAbortControllerCleanupSymbol = Symbol.for(
+  "astro.nodeRequestAbortControllerCleanup"
+);
+const responseSentSymbol = Symbol.for("astro.responseSent");
+const SUPPORTED_MARKDOWN_FILE_EXTENSIONS = [
+  ".markdown",
+  ".mdown",
+  ".mkdn",
+  ".mkd",
+  ".mdwn",
+  ".md"
+];
+const MIDDLEWARE_PATH_SEGMENT_NAME = "middleware";
+export {
+  ASTRO_VERSION,
+  DEFAULT_404_COMPONENT,
+  MIDDLEWARE_PATH_SEGMENT_NAME,
+  NOOP_MIDDLEWARE_HEADER,
+  REDIRECT_STATUS_CODES,
+  REROUTABLE_STATUS_CODES,
+  REROUTE_DIRECTIVE_HEADER,
+  REWRITE_DIRECTIVE_HEADER_KEY,
+  REWRITE_DIRECTIVE_HEADER_VALUE,
+  ROUTE_TYPE_HEADER,
+  SUPPORTED_MARKDOWN_FILE_EXTENSIONS,
+  clientAddressSymbol,
+  clientLocalsSymbol,
+  nodeRequestAbortControllerCleanupSymbol,
+  originPathnameSymbol,
+  responseSentSymbol
+};