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-html/transform/escape.js

@@ -0,0 +1,30 @@
+import { visit } from "unist-util-visit";
+import { escapeTemplateLiteralCharacters, needsEscape, replaceAttribute } from "./utils.js";
+const rehypeEscape = ({ s }) => {
+  return (tree) => {
+    visit(tree, (node) => {
+      if (node.type === "text" || node.type === "comment") {
+        if (needsEscape(node.value)) {
+          s.overwrite(
+            node.position.start.offset,
+            node.position.end.offset,
+            escapeTemplateLiteralCharacters(node.value)
+          );
+        }
+      } else if (node.type === "element") {
+        if (!node.properties) return;
+        for (let [key, value] of Object.entries(node.properties)) {
+          key = key.replace(/([A-Z])/g, "-$1").toLowerCase();
+          const newKey = needsEscape(key) ? escapeTemplateLiteralCharacters(key) : key;
+          const newValue = needsEscape(value) ? escapeTemplateLiteralCharacters(value) : value;
+          if (newKey === key && newValue === value) continue;
+          replaceAttribute(s, node, key, value === "" ? newKey : `${newKey}="${newValue}"`);
+        }
+      }
+    });
+  };
+};
+var escape_default = rehypeEscape;
+export {
+  escape_default as default
+};