feat(system):优化后端

1.新增后端测试
2.增加了后端的加密
3.增加了i18n（国际化）

tests/conftest.py

@@ -0,0 +1,87 @@
+"""Pytest 全局 fixture：把 Ray Actor 句柄、PostgresDatabase、loguru 等重副作用模块替换成可控的 stub。"""
+
+from __future__ import annotations
+
+import sys
+import types
+from typing import Any, Dict, Optional
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# Ray actor 句柄存根：测试期不真正连 Ray，由 conftest 注入名字 -> AsyncMock 句柄
+# ─────────────────────────────────────────────────────────────────────────────
+
+
+class _FakeActorRegistry:
+    """模拟 ``ray.get_actor`` 行为：测试可往里塞名字 -> AsyncMock。"""
+
+    def __init__(self) -> None:
+        self._actors: Dict[str, Any] = {}
+
+    def register(self, name: str, handle: Any) -> None:
+        self._actors[name] = handle
+
+    def get(self, name: str, namespace: str = "kilostar"):  # noqa: ARG002
+        if name not in self._actors:
+            raise ValueError(f"FakeActorRegistry: actor {name!r} not registered")
+        return self._actors[name]
+
+    def clear(self) -> None:
+        self._actors.clear()
+
+
+@pytest.fixture
+def fake_actors(monkeypatch) -> _FakeActorRegistry:
+    """把 ``kilostar.utils.ray_hook._get_cached_actor_handle`` 的实现替换为 fake registry。
+
+    用法::
+
+        def test_xxx(fake_actors):
+            gsm = AsyncMock()
+            gsm.get_tool_config.remote = AsyncMock(return_value={"api_key": "k"})
+            fake_actors.register("global_state_machine", types.SimpleNamespace(global_state_machine=gsm))
+    """
+    registry = _FakeActorRegistry()
+
+    from kilostar.utils import ray_hook
+
+    ray_hook.clear_actor_cache()
+    original = ray_hook._get_cached_actor_handle
+
+    def _stub(actor_name: str):
+        return registry.get(actor_name)
+
+    _stub.cache_clear = lambda: None  # type: ignore[attr-defined]
+    monkeypatch.setattr(ray_hook, "_get_cached_actor_handle", _stub)
+    yield registry
+    registry.clear()
+    monkeypatch.setattr(ray_hook, "_get_cached_actor_handle", original)
+    ray_hook.clear_actor_cache()
+
+
+@pytest.fixture
+def gsm_handle(fake_actors) -> MagicMock:
+    """快捷 fixture：注册一个名为 ``global_state_machine`` 的 actor，返回其内部 mock。
+
+    内部 mock 的方法默认全部是 ``AsyncMock``，调用 ``.remote(...)`` 会按 AsyncMock 规则返回。
+    """
+    gsm = MagicMock()
+    container = types.SimpleNamespace(global_state_machine=gsm)
+    fake_actors.register("global_state_machine", container)
+    return gsm
+
+
+# ─────────────────────────────────────────────────────────────────────────────
+# 工具：构造一个 ``MCP_AVAILABLE`` 关闭的 mcp_helper 状态
+# ─────────────────────────────────────────────────────────────────────────────
+
+
+@pytest.fixture
+def mcp_unavailable(monkeypatch):
+    from kilostar.utils import mcp_helper
+
+    monkeypatch.setattr(mcp_helper, "_MCP_AVAILABLE", False)
+    yield