feat(reward): 新增客户端奖励中心

lib/pages/discover/discover_types.dart

@@ -5,7 +5,7 @@ import 'package:flutter/foundation.dart';
 import '../../core/data/models/drama.dart';
 
 /// 推荐页与根导航之间的动作。
-enum DiscoverPageAction { home, recommend, following, mine }
+enum DiscoverPageAction { home, recommend, reward, following, mine }
 
 /// 剧场页导航回调；没有 `onAction` 时按独立页面处理。
 class DiscoverPageCallbacks {

lib/pages/discover/discover_view.dart

@@ -472,6 +472,7 @@ class _DiscoverPageState extends State<DiscoverPage> {
   DiscoverPageAction _actionOf(AppRootTab tab) => switch (tab) {
     AppRootTab.home => DiscoverPageAction.home,
     AppRootTab.recommend => DiscoverPageAction.recommend,
+    AppRootTab.reward => DiscoverPageAction.reward,
     AppRootTab.following => DiscoverPageAction.following,
     AppRootTab.mine => DiscoverPageAction.mine,
   };

lib/pages/discover/widgets/drama_grid.dart

@@ -14,7 +14,7 @@ const double _columnGap = 8;
 const double _cardGap = 14;
 const double _gridHorizontalPadding = 12;
 const double _coverAspectRatio = 3 / 4;
-const double _coverRadius = 10;
+const double _coverRadius = AppDimens.coverRadius;
 const double _titleGap = 8;
 const double _tagsGap = 6;
 const double _titleFontSize = 15;