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/assets/utils/metadata.js

@@ -0,0 +1,30 @@
+import { AstroError, AstroErrorData } from "../../core/errors/index.js";
+import { lookup as probe } from "../utils/vendor/image-size/lookup.js";
+async function imageMetadata(data, src) {
+  let result;
+  try {
+    result = probe(data);
+  } catch {
+    throw new AstroError({
+      ...AstroErrorData.NoImageMetadata,
+      message: AstroErrorData.NoImageMetadata.message(src)
+    });
+  }
+  if (!result.height || !result.width || !result.type) {
+    throw new AstroError({
+      ...AstroErrorData.NoImageMetadata,
+      message: AstroErrorData.NoImageMetadata.message(src)
+    });
+  }
+  const { width, height, type, orientation } = result;
+  const isPortrait = (orientation || 0) >= 5;
+  return {
+    width: isPortrait ? height : width,
+    height: isPortrait ? width : height,
+    format: type,
+    orientation
+  };
+}
+export {
+  imageMetadata
+};