feat: 新增工具插件、系统日志、workflow配置及前端优化

1. 新增工具插件(edit_file, python_executor, search_file, shell_executor, write_file)
2. 新增系统事件日志模块和API
3. 新增workflow配置文件和详情API
4. 前端增加SSE、错误边界、设置引导等组件
5. 优化认证加密、速率限制、配置加载等工具模块
6. 删除废弃的cluster和health API
7. 补充单元测试和集成测试

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/test_workflow_graph.py

@@ -288,3 +288,37 @@ def test_workflow_graph_state_defaults():
     assert state.final_status == WorkflowStatus.RUNNING.value
     assert state.logs == []
     assert state.original_command == ""
+    assert state.jump_counts == {}
+
+
+@pytest.mark.asyncio
+async def test_loop_retry_exceeds_max_attempts_fails(monkeypatch):
+    """环跳转超过 max_attempts 后，工作流应直接 FAILED 而非无限重试。"""
+    from kilostar.utils import config_loader
+    from kilostar.utils.config_loader import WorkflowConfig, RetryConfig
+
+    monkeypatch.setattr(config_loader, "_current", WorkflowConfig(retry=RetryConfig(max_attempts=2)))
+
+    deps, sink = _make_deps(
+        skill_outputs=[
+            ("o1", True),
+            ("fail", False),
+            ("o1", True),
+            ("fail", False),
+            ("o1", True),
+            ("fail", False),
+            ("o1", True),
+            ("fail", False),
+        ]
+    )
+    workflow_data = {
+        "work_link": [
+            {"step": 1, "name": "s1", "action": "do",
+             "node": "skill_individual", "agent_id": "a1"},
+            {"step": 2, "name": "s2", "action": "do",
+             "node": "skill_individual", "agent_id": "a2",
+             "logic_gate": {"if_fail": "jump_to_step_1", "if_pass": "continue"}},
+        ]
+    }
+    final = await run_workflow_graph(workflow_data, "trace-loop-limit", deps=deps)
+    assert final == WorkflowStatus.FAILED.value