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-hmr-reload/index.d.ts

@@ -0,0 +1,7 @@
+import type { Plugin } from 'vite';
+/**
+ * The very last Vite plugin to reload the browser if any SSR-only module are updated
+ * which will require a full page reload. This mimics the behaviour of Vite 5 where
+ * it used to unconditionally reload for us.
+ */
+export default function hmrReload(): Plugin;

node_modules/astro/dist/vite-plugin-hmr-reload/index.js

@@ -0,0 +1,28 @@
+function hmrReload() {
+  return {
+    name: "astro:hmr-reload",
+    enforce: "post",
+    hotUpdate: {
+      order: "post",
+      handler({ modules, server, timestamp }) {
+        if (this.environment.name !== "ssr") return;
+        let hasSsrOnlyModules = false;
+        const invalidatedModules = /* @__PURE__ */ new Set();
+        for (const mod of modules) {
+          if (mod.id == null) continue;
+          const clientModule = server.environments.client.moduleGraph.getModuleById(mod.id);
+          if (clientModule != null) continue;
+          this.environment.moduleGraph.invalidateModule(mod, invalidatedModules, timestamp, true);
+          hasSsrOnlyModules = true;
+        }
+        if (hasSsrOnlyModules) {
+          server.ws.send({ type: "full-reload" });
+          return [];
+        }
+      }
+    }
+  };
+}
+export {
+  hmrReload as default
+};