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/micromark-util-decode-numeric-character-reference/dev/index.js

@@ -0,0 +1,42 @@
+import {codes, values} from 'micromark-util-symbol'
+
+/**
+ * Turn the number (in string form as either hexa- or plain decimal) coming from
+ * a numeric character reference into a character.
+ *
+ * Sort of like `String.fromCodePoint(Number.parseInt(value, base))`, but makes
+ * non-characters and control characters safe.
+ *
+ * @param {string} value
+ *   Value to decode.
+ * @param {number} base
+ *   Numeric base.
+ * @returns {string}
+ *   Character.
+ */
+export function decodeNumericCharacterReference(value, base) {
+  const code = Number.parseInt(value, base)
+
+  if (
+    // C0 except for HT, LF, FF, CR, space.
+    code < codes.ht ||
+    code === codes.vt ||
+    (code > codes.cr && code < codes.space) ||
+    // Control character (DEL) of C0, and C1 controls.
+    (code > codes.tilde && code < 160) ||
+    // Lone high surrogates and low surrogates.
+    (code > 55_295 && code < 57_344) ||
+    // Noncharacters.
+    (code > 64_975 && code < 65_008) ||
+    /* eslint-disable no-bitwise */
+    (code & 65_535) === 65_535 ||
+    (code & 65_535) === 65_534 ||
+    /* eslint-enable no-bitwise */
+    // Out of range
+    code > 1_114_111
+  ) {
+    return values.replacementCharacter
+  }
+
+  return String.fromCodePoint(code)
+}