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/@astrojs/compiler/dist/shared/diagnostics.d.ts

@@ -0,0 +1,18 @@
+declare enum DiagnosticCode {
+    ERROR = 1000,
+    ERROR_UNTERMINATED_JS_COMMENT = 1001,
+    ERROR_FRAGMENT_SHORTHAND_ATTRS = 1002,
+    ERROR_UNMATCHED_IMPORT = 1003,
+    ERROR_UNSUPPORTED_SLOT_ATTRIBUTE = 1004,
+    WARNING = 2000,
+    WARNING_UNTERMINATED_HTML_COMMENT = 2001,
+    WARNING_UNCLOSED_HTML_TAG = 2002,
+    WARNING_DEPRECATED_DIRECTIVE = 2003,
+    WARNING_IGNORED_DIRECTIVE = 2004,
+    WARNING_UNSUPPORTED_EXPRESSION = 2005,
+    WARNING_SET_WITH_CHILDREN = 2006,
+    INFO = 3000,
+    HINT = 4000
+}
+
+export { DiagnosticCode };