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-core-commonmark/lib/hard-break-escape.js

@@ -0,0 +1,60 @@
+/**
+ * @import {
+ *   Construct,
+ *   State,
+ *   TokenizeContext,
+ *   Tokenizer
+ * } from 'micromark-util-types'
+ */
+
+import { markdownLineEnding } from 'micromark-util-character';
+/** @type {Construct} */
+export const hardBreakEscape = {
+  name: 'hardBreakEscape',
+  tokenize: tokenizeHardBreakEscape
+};
+
+/**
+ * @this {TokenizeContext}
+ *   Context.
+ * @type {Tokenizer}
+ */
+function tokenizeHardBreakEscape(effects, ok, nok) {
+  return start;
+
+  /**
+   * Start of a hard break (escape).
+   *
+   * ```markdown
+   * > | a\
+   *      ^
+   *   | b
+   * ```
+   *
+   * @type {State}
+   */
+  function start(code) {
+    effects.enter("hardBreakEscape");
+    effects.consume(code);
+    return after;
+  }
+
+  /**
+   * After `\`, at eol.
+   *
+   * ```markdown
+   * > | a\
+   *       ^
+   *   | b
+   * ```
+   *
+   *  @type {State}
+   */
+  function after(code) {
+    if (markdownLineEnding(code)) {
+      effects.exit("hardBreakEscape");
+      return ok(code);
+    }
+    return nok(code);
+  }
+}