feat(channel): enhance channel service with caching and repository updates

- Updated ChannelService to include caching for channel lists, improving performance and reducing database load.
- Introduced cache invalidation methods to ensure channel list consistency after modifications.
- Modified ChannelRepository to remove unused ListByIDs method, streamlining the repository interface.
- Updated wire generation to inject cache into ChannelService for enhanced functionality.
- Added new cache key constants for channel-related data management.

internal/cache/keys.go

@@ -31,6 +31,9 @@ const (
 	PrefixUserInfo = "users:info"
 	PrefixUserMe   = "users:me"
 
+	// 频道相关（全量列表一条缓存，供 /channels、帖子 channel 填充共用）
+	PrefixChannelsAllList = "channels:all_list"
+
 	// 消息缓存相关
 	keyPrefixMsgHash  = "msg_hash"  // 消息详情 Hash
 	keyPrefixMsgIndex = "msg_index" // 消息索引 Sorted Set
@@ -116,6 +119,16 @@ func UserMeKey(userID string) string {
 	return fmt.Sprintf("%s:%s", PrefixUserMe, userID)
 }
 
+// ChannelsAllListKey 频道全量列表缓存键（含未启用，供 MapByIDs 解析历史帖子 channel）
+func ChannelsAllListKey() string {
+	return PrefixChannelsAllList
+}
+
+// InvalidateChannelList 失效频道列表缓存（管理端增删改频道后调用）
+func InvalidateChannelList(c Cache) {
+	c.Delete(ChannelsAllListKey())
+}
+
 // InvalidatePostList 失效帖子列表缓存
 func InvalidatePostList(cache Cache) {
 	cache.DeleteByPrefix(PrefixPostList)