refactor: rename current channel to guanghu-ice-heart

HLCC-FIFTH-DOMAIN-ROUTE.hdlp

@@ -52,8 +52,8 @@
 
 ```yaml
 new_write_source:
-  web: https://guanghulab.com/code/bingshuo/fifth-domain
-  git: https://guanghulab.com/code/bingshuo/fifth-domain.git
+  web: https://guanghulab.com/code/bingshuo/guanghu-ice-heart
+  git: https://guanghulab.com/code/bingshuo/guanghu-ice-heart.git
   numbering: HLCC-ICE-000001+
 
 legacy_history_source:
@@ -63,6 +63,14 @@ legacy_history_source:
     - 旧提交 SHA 回看
     - 旧编号与演化链核验
     - 2026-07-23 以前的历史事实源
+
+origin_history_source:
+  web: https://github.com/qinfendebingshuo/guanghulab
+  git: https://github.com/qinfendebingshuo/guanghulab.git
+  role:
+    - 光湖最初公开代码仓库
+    - 搬迁前的早期架构、提交与时间线
+    - 只读历史源，不作为当前写入入口
 ```
 
 新仓保存启用时的完整结构快照，因此不带旧 SHA 的路径检索优先留在当前仓库；