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/astro/dist/vite-plugin-adapter-config/index.js

@@ -0,0 +1,33 @@
+const VIRTUAL_CLIENT_ID = "virtual:astro:adapter-config/client";
+const RESOLVED_VIRTUAL_CLIENT_ID = "\0" + VIRTUAL_CLIENT_ID;
+function vitePluginAdapterConfig(settings) {
+  return {
+    name: "astro:adapter-config",
+    resolveId(id) {
+      if (id === VIRTUAL_CLIENT_ID) {
+        return RESOLVED_VIRTUAL_CLIENT_ID;
+      }
+    },
+    load(id, options) {
+      if (id === RESOLVED_VIRTUAL_CLIENT_ID) {
+        if (options?.ssr) {
+          return {
+            code: `export const internalFetchHeaders = {};`
+          };
+        }
+        const adapter = settings.adapter;
+        const clientConfig = adapter?.client || {};
+        let internalFetchHeaders = {};
+        if (clientConfig.internalFetchHeaders) {
+          internalFetchHeaders = typeof clientConfig.internalFetchHeaders === "function" ? clientConfig.internalFetchHeaders() : clientConfig.internalFetchHeaders;
+        }
+        return {
+          code: `export const internalFetchHeaders = ${JSON.stringify(internalFetchHeaders)};`
+        };
+      }
+    }
+  };
+}
+export {
+  vitePluginAdapterConfig
+};