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/decode-named-character-reference/index.dom.js

@@ -0,0 +1,32 @@
+/// <reference lib="dom" />
+
+/* global document */
+
+const element = document.createElement('i')
+
+/**
+ * @param {string} value
+ * @returns {string | false}
+ */
+export function decodeNamedCharacterReference(value) {
+  const characterReference = '&' + value + ';'
+  element.innerHTML = characterReference
+  const character = element.textContent
+
+  // Some named character references do not require the closing semicolon
+  // (`&not`, for instance), which leads to situations where parsing the assumed
+  // named reference of `&notit;` will result in the string `¬it;`.
+  // When we encounter a trailing semicolon after parsing, and the character
+  // reference to decode was not a semicolon (`&semi;`), we can assume that the
+  // matching was not complete.
+  if (
+    character.charCodeAt(character.length - 1) === 59 /* `;` */ &&
+    value !== 'semi'
+  ) {
+    return false
+  }
+
+  // If the decoded string is equal to the input, the character reference was
+  // not valid.
+  return character === characterReference ? false : character
+}