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/unit/test_provider_manager.py

@@ -0,0 +1,110 @@
+"""``ProviderManager.add_provider`` happy path：
+- mock 掉具体 Provider 适配器的 ``create_provider``；
+- 验证内存注册表写入 + postgres_database.add_provider_db.remote 被正确调用。
+"""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from kilostar.core.global_state_machine.provider_manager import ProviderManager
+from kilostar.core.global_state_machine.model_provider.base_provider import Provider
+
+
+@pytest.mark.asyncio
+async def test_add_provider_happy_path_writes_register_and_db():
+    pm = ProviderManager(postgres=None)
+
+    fake_provider = Provider(
+        provider_title="my-openai",
+        provider_url="https://api.openai.com",
+        provider_apikey="sk-xxx",
+        provider_models=["gpt-4o"],
+        provider_type="openai",
+        provider_owner="alice",
+    )
+
+    pm.provider_mapper["openai"] = MagicMock()
+    pm.provider_mapper["openai"].create_provider = AsyncMock(return_value=fake_provider)
+
+    postgres = MagicMock()
+    postgres.add_provider_db = MagicMock()
+    postgres.add_provider_db.remote = AsyncMock(return_value=None)
+
+    await pm.add_provider(
+        provider_type="openai",
+        provider_title="my-openai",
+        provider_url="https://api.openai.com",
+        provider_apikey="sk-xxx",
+        provider_owner="alice",
+        postgres_database=postgres,
+    )
+
+    assert "my-openai" in pm.provider_register
+    assert pm.provider_register["my-openai"] is fake_provider
+    postgres.add_provider_db.remote.assert_awaited_once()
+    kwargs = postgres.add_provider_db.remote.await_args.kwargs
+    assert kwargs["provider_title"] == "my-openai"
+    assert kwargs["provider_apikey"] == "sk-xxx"
+    assert kwargs["provider_models"] == ["gpt-4o"]
+
+
+@pytest.mark.asyncio
+async def test_add_provider_unknown_type_returns_none(caplog):
+    pm = ProviderManager(postgres=None)
+    postgres = MagicMock()
+    postgres.add_provider_db = MagicMock()
+    postgres.add_provider_db.remote = AsyncMock()
+
+    result = await pm.add_provider(
+        provider_type="not_supported",
+        provider_title="x",
+        provider_url="u",
+        provider_apikey="k",
+        provider_owner="o",
+        postgres_database=postgres,
+    )
+
+    assert result is None
+    assert "x" not in pm.provider_register
+    postgres.add_provider_db.remote.assert_not_awaited()
+
+
+@pytest.mark.asyncio
+async def test_add_provider_network_error_raises_retryable():
+    """网络异常应被包装为 RetryableError 重抛。"""
+    import httpx
+    from kilostar.utils.error import RetryableError
+
+    pm = ProviderManager(postgres=None)
+    pm.provider_mapper["openai"] = MagicMock()
+    pm.provider_mapper["openai"].create_provider = AsyncMock(
+        side_effect=httpx.ConnectError("network down")
+    )
+
+    postgres = MagicMock()
+    postgres.add_provider_db = MagicMock()
+    postgres.add_provider_db.remote = AsyncMock()
+
+    with pytest.raises(RetryableError):
+        await pm.add_provider(
+            provider_type="openai",
+            provider_title="x",
+            provider_url="u",
+            provider_apikey="k",
+            provider_owner="o",
+            postgres_database=postgres,
+        )
+
+
+def test_get_provider_list_returns_internal_dict():
+    pm = ProviderManager(postgres=None)
+    pm.provider_register["a"] = "fake"
+    assert pm.get_provider_list()["a"] == "fake"
+
+
+def test_get_provider_returns_none_when_missing():
+    pm = ProviderManager(postgres=None)
+    assert pm.get_provider("nope") is None