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/mdast-util-gfm-strikethrough/lib/index.d.ts

@@ -0,0 +1,23 @@
+/**
+ * Create an extension for `mdast-util-from-markdown` to enable GFM
+ * strikethrough in markdown.
+ *
+ * @returns {FromMarkdownExtension}
+ *   Extension for `mdast-util-from-markdown` to enable GFM strikethrough.
+ */
+export function gfmStrikethroughFromMarkdown(): FromMarkdownExtension
+/**
+ * Create an extension for `mdast-util-to-markdown` to enable GFM
+ * strikethrough in markdown.
+ *
+ * @returns {ToMarkdownExtension}
+ *   Extension for `mdast-util-to-markdown` to enable GFM strikethrough.
+ */
+export function gfmStrikethroughToMarkdown(): ToMarkdownExtension
+export type Delete = import('mdast').Delete
+export type CompileContext = import('mdast-util-from-markdown').CompileContext
+export type FromMarkdownExtension = import('mdast-util-from-markdown').Extension
+export type FromMarkdownHandle = import('mdast-util-from-markdown').Handle
+export type ConstructName = import('mdast-util-to-markdown').ConstructName
+export type ToMarkdownHandle = import('mdast-util-to-markdown').Handle
+export type ToMarkdownExtension = import('mdast-util-to-markdown').Options