feat(home): 首页改为三列探索网格

lib/core/data/models/drama.dart

@@ -86,6 +86,8 @@ class Drama {
     this.favoriteCount,
     this.commentCount,
     this.language = '',
+    this.dramaType = '',
+    this.createdAt,
     this.detailLoaded = false,
   });
 
@@ -109,6 +111,12 @@ class Drama {
   /// 卡片语种（如 zh-CN / id），用于剧场语言筛选。
   final String language;
 
+  /// 内容类型：ANIME 漫剧，LIVE 真人剧。
+  final String dramaType;
+
+  /// 上架时间；卡片接口未直接下发时可由 Snowflake id 估算。
+  final DateTime? createdAt;
+
   /// 详情接口是否已经取过完整剧集列表。
   /// 列表卡片只带一集可播预览，需要完整剧集时再进详情。
   final bool detailLoaded;
@@ -137,6 +145,8 @@ class Drama {
       favoriteCount: _optionalInt(json['favoriteCount']),
       commentCount: _optionalInt(json['commentCount']),
       language: json['language'] as String? ?? '',
+      dramaType: json['dramaType'] as String? ?? '',
+      createdAt: DateTime.tryParse(json['createdAt']?.toString() ?? ''),
     );
   }
 
@@ -157,6 +167,8 @@ class Drama {
       favoriteCount: _optionalInt(json['favoriteCount']),
       commentCount: _optionalInt(json['commentCount']),
       language: json['language'] as String? ?? '',
+      dramaType: json['dramaType'] as String? ?? '',
+      createdAt: DateTime.tryParse(json['createdAt']?.toString() ?? ''),
       detailLoaded: true,
       episodes: (json['episodes'] as List? ?? const [])
           .whereType<Map<String, dynamic>>()

lib/core/theme/app_colors.dart

@@ -60,6 +60,18 @@ abstract final class AppColors {
   /// 页面背景。
   static const ink = Color(0xFF0B1020);
 
+  /// 首页/追剧/我的统一的纯黑内容背景。
+  static const appBackground = Color(0xFF000000);
+
+  /// 中性深灰卡片与控件表面。
+  static const contentCard = Color(0xFF171717);
+  static const contentSurface = Color(0xFF1C1C1E);
+  static const contentChip = Color(0xFF2C2C2E);
+  static const contentBorder = Color(0x1AFFFFFF);
+
+  /// 次级文字与列表 chevron。
+  static const textSecondary = Color(0xFF8E8E93);
+
   /// 原生开屏与冷启动过渡底色。
   static const splashInk = ink;
 
@@ -125,7 +137,12 @@ abstract final class AppColors {
   static const badgeBeige = raised;
 
   /// 导航未选中。
-  static const navUnselected = Color(0xFF8E8E93);
+  static const navUnselected = textSecondary;
+
+  /// 首页内容角标。
+  static const badgeHot = Color(0xFFE5484D);
+  static const badgeNew = Color(0xFF3B82F6);
+  static const badgeAnime = Color(0xFF8B5CF6);
 
   /// 播放器次要文字。
   static const playerMuted = Color(0xA3FFFFFF);

lib/core/theme/app_dimens.dart

@@ -73,4 +73,18 @@ abstract final class AppDimens {
   static const double cardTitle = 15;
   static const double cardShadowBlur = 0;
   static const double cardShadowY = 0;
+
+  /// 首页探索网格。
+  static const double homeGridGap = 8;
+  static const double homeCardRadius = 8;
+  static const double homeCardPadding = 8;
+  static const double homeCardTitle = 13;
+  static const double homeCardMeta = 10;
+  static const double homeCardBadge = 9;
+  static const double homeTagFont = 10;
+  static const double homeCardBodyExtent = 84;
+  static const double homeSectionFont = 14;
+  static const double homeSectionIndicator = 2;
+  static const double homeIconSlot = 44;
+  static const double homeHeaderIcon = 22;
 }