feat: 添加 list_skill_events 方法到 SkillEventRepository，支持可选 session_id 参数

src/storage/ports.rs

@@ -343,4 +343,9 @@ impl SkillEventRepository for super::SessionStore {
     }
 
     fn list_skill_events(
-     
+        &self,
+        session_id: Option<&str>,
+    ) -> Result<Vec<SkillEventRecord>, StorageError> {
+        super::SessionStore::list_skill_events(self, session_id)
+    }
+}