feat(flutter): 剧场搜索框改白底并新增榜单新剧预约页

lib/pages/reserve/reserve_page.dart

@@ -0,0 +1,48 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+
+import '../../core/theme/app_colors.dart';
+import '../../core/widgets/empty_state.dart';
+import '../../core/widgets/plain_page_scaffold.dart';
+import '../../l10n/app_localizations.dart';
+
+/// 剧场预约页：暂无预约数据源，展示空态与即将上线说明。
+class ReservePage extends StatelessWidget {
+  const ReservePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final l10n = AppLocalizations.of(context)!;
+    return PlainPageScaffold(
+      pageKey: const Key('reserve-page'),
+      backKey: const Key('reserve-back'),
+      title: l10n.reserve,
+      subtitle: l10n.reserveSubtitle,
+      child: Center(
+        child: SingleChildScrollView(
+          padding: const EdgeInsets.all(24),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              EmptyState(
+                key: const Key('reserve-empty'),
+                icon: Icons.event_available_outlined,
+                title: l10n.reserveEmptyTitle,
+                subtitle: l10n.reserveEmptyHint,
+              ),
+              const SizedBox(height: 12),
+              TextButton(
+                onPressed: null,
+                child: Text(
+                  l10n.comingSoon,
+                  style: const TextStyle(color: AppColors.subtle),
+                ),
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}