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/shiki/dist/index.mjs

@@ -0,0 +1,6 @@
+export { codeToHast, codeToHtml, codeToTokens, codeToTokensBase, codeToTokensWithThemes, createHighlighter, getLastGrammarState, getSingletonHighlighter } from './bundle-full.mjs';
+export { createJavaScriptRegexEngine, defaultJavaScriptRegexConstructor } from '@shikijs/engine-javascript';
+export { createOnigurumaEngine, loadWasm } from '@shikijs/engine-oniguruma';
+export * from '@shikijs/core';
+export { bundledLanguages, bundledLanguagesAlias, bundledLanguagesBase, bundledLanguagesInfo } from './langs.mjs';
+export { bundledThemes, bundledThemesInfo } from './themes.mjs';