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/cli/infra/tinyexec-command-executor.js

@@ -0,0 +1,34 @@
+import { NonZeroExitError, x } from "tinyexec";
+class TinyexecCommandExecutor {
+  async execute(command, args, options) {
+    const proc = x(command, args, {
+      throwOnError: true,
+      nodeOptions: {
+        cwd: options?.cwd,
+        env: options?.env,
+        shell: options?.shell,
+        stdio: options?.stdio
+      }
+    });
+    if (options?.input) {
+      proc.process?.stdin?.end(options.input);
+    }
+    return await proc.then(
+      (o) => o,
+      (e) => {
+        if (e instanceof NonZeroExitError) {
+          const fullCommand = args?.length ? `${command} ${args.map((a) => a.includes(" ") ? `"${a}"` : a).join(" ")}` : command;
+          const message = `The command \`${fullCommand}\` exited with code ${e.exitCode}`;
+          const newError = new Error(message, e.cause ? { cause: e.cause } : void 0);
+          newError.stderr = e.output?.stderr;
+          newError.stdout = e.output?.stdout;
+          throw newError;
+        }
+        throw e;
+      }
+    );
+  }
+}
+export {
+  TinyexecCommandExecutor
+};