清理已删除的 backend/frontend/planner/storage Agent 配置及残留目录

- 删除 agents/backend/, agents/frontend/, agents/planner/, agents/storage/
- 删除 workspace-backend/, workspace-frontend/, workspace-planner/, workspace-storage/
- 更新 MEMORY.md Agent 表格（移除已删除项，补充 juaner/test-long-task）
- 新增 test-long-task Agent（identity.prompt + models.json）

openclaw.json

@@ -239,7 +239,8 @@
       "visibility": "all"
     },
     "agentToAgent": {
-      "enabled": true
+      "enabled": true,
+      "allow": ["main", "resume", "sql", "travel", "fitness", "finances", "juaner"]
     },
     "deny": [
       "group:web",