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/hast-util-to-html/lib/handle/text.js

@@ -0,0 +1,38 @@
+/**
+ * @import {Parents, Text} from 'hast'
+ * @import {Raw} from 'mdast-util-to-hast'
+ * @import {State} from '../index.js'
+ */
+
+import {stringifyEntities} from 'stringify-entities'
+
+// Declare array as variable so it can be cached by `stringifyEntities`
+const textEntitySubset = ['<', '&']
+
+/**
+ * Serialize a text node.
+ *
+ * @param {Raw | Text} node
+ *   Node to handle.
+ * @param {number | undefined} _
+ *   Index of `node` in `parent.
+ * @param {Parents | undefined} parent
+ *   Parent of `node`.
+ * @param {State} state
+ *   Info passed around about the current state.
+ * @returns {string}
+ *   Serialized node.
+ */
+export function text(node, _, parent, state) {
+  // Check if content of `node` should be escaped.
+  return parent &&
+    parent.type === 'element' &&
+    (parent.tagName === 'script' || parent.tagName === 'style')
+    ? node.value
+    : stringifyEntities(
+        node.value,
+        Object.assign({}, state.settings.characterReferences, {
+          subset: textEntitySubset
+        })
+      )
+}