feat(workflow): add workflow engine, /workflows panel, /ultracode skill

将 feat/sdk-backend 分支中 workflow 相关的 20 个 commit 压缩为单 commit：

- 工作流引擎核心：phase / agent / parallel / pipeline 编排原语（packages/workflow-engine/）
- /workflows 面板：三区焦点布局（顶部 run tabs + 左侧 phase 侧栏 + 右侧 agent 列表）
- /ultracode skill：多 agent workflow 编排入口
- 进度存储 / journal / notification 系统
- WorkflowService 生命周期管理 + SentryErrorBoundary
- 脚本沙箱：禁用 dynamic import()、JSON args 防御性归一化
- journal 与 named-workflow 路径统一在 projectRoot
- 错误处理：parallel/pipeline hooks 错误日志、failure routing、semaphore abort
- workflow 工具升级为 core 工具 + PascalCase 命名

Co-Authored-By: glm-5.1 <zai-org@claude-code-best.win>

tsconfig.json

@@ -23,7 +23,13 @@
       "@claude-code-best/agent-tools/*": ["./packages/agent-tools/src/*"],
       "@claude-code-best/agent-tools": ["./packages/agent-tools/src/index.ts"],
       "@claude-code-best/weixin/*": ["./packages/weixin/src/*"],
-      "@claude-code-best/weixin": ["./packages/weixin/src/index.ts"]
+      "@claude-code-best/weixin": ["./packages/weixin/src/index.ts"],
+      "@claude-code-best/workflow-engine/*": [
+        "./packages/workflow-engine/src/*"
+      ],
+      "@claude-code-best/workflow-engine": [
+        "./packages/workflow-engine/src/index.ts"
+      ]
     }
   },
   "include": [