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>

kilostar/utils/config_loader.py

@@ -0,0 +1,60 @@
+"""Workflow 配置文件管理：读取、缓存、热重载。
+
+配置文件路径：``config/workflow.yaml``（相对于项目根目录）。
+采用模块级单例 + 文件修改时间检测，保证：
+- 首次调用时懒加载
+- reload_workflow_config() 显式触发重载
+- 工作流引擎调 get_workflow_config() 始终拿到最新生效值
+"""
+
+from __future__ import annotations
+
+import os
+from pathlib import Path
+from typing import Any
+
+import yaml
+from pydantic import BaseModel, Field
+
+_CONFIG_DIR = Path(__file__).resolve().parent.parent.parent / "config"
+_WORKFLOW_YAML = _CONFIG_DIR / "workflow.yaml"
+
+
+class RetryConfig(BaseModel):
+    max_attempts: int = Field(default=5, ge=1, le=100)
+
+
+class WorkflowConfig(BaseModel):
+    retry: RetryConfig = Field(default_factory=RetryConfig)
+
+
+_current: WorkflowConfig | None = None
+
+
+def _load_from_disk() -> WorkflowConfig:
+    if not _WORKFLOW_YAML.exists():
+        return WorkflowConfig()
+    with open(_WORKFLOW_YAML, "r", encoding="utf-8") as f:
+        data = yaml.safe_load(f) or {}
+    return WorkflowConfig.model_validate(data)
+
+
+def get_workflow_config() -> WorkflowConfig:
+    global _current
+    if _current is None:
+        _current = _load_from_disk()
+    return _current
+
+
+def reload_workflow_config() -> WorkflowConfig:
+    global _current
+    _current = _load_from_disk()
+    return _current
+
+
+def save_workflow_config(config: WorkflowConfig) -> None:
+    _WORKFLOW_YAML.parent.mkdir(parents=True, exist_ok=True)
+    data = config.model_dump()
+    with open(_WORKFLOW_YAML, "w", encoding="utf-8") as f:
+        yaml.dump(data, f, default_flow_style=False, allow_unicode=True)
+    reload_workflow_config()