fix(stability): 健康监控 DB 操作异步化，防止 worker 超时崩溃

- executor: record_success 通过 asyncio.to_thread offload 到线程池
- error_handler: 3 处 record_failure 同样 offload 到线程池
- sync_execute: 设置 expire_on_commit=False 防止 commit 后 ORM 懒加载
- handler_adapter_base: 归一化 check_endpoint 的 base_url 输入

tests/unit/test_handler_adapter_base.py

@@ -0,0 +1,62 @@
+import pytest
+
+from src.api.handlers.claude.adapter import ClaudeChatAdapter
+
+
+@pytest.mark.asyncio
+async def test_check_endpoint_accepts_base_url_dict(monkeypatch: pytest.MonkeyPatch) -> None:
+    captured: dict[str, object] = {}
+
+    async def fake_run_endpoint_check(**kwargs):
+        captured.update(kwargs)
+        return {"status_code": 200, "headers": {}, "response_time_ms": 1, "request_id": "test"}
+
+    monkeypatch.setattr(
+        "src.api.handlers.base.endpoint_checker.run_endpoint_check",
+        fake_run_endpoint_check,
+    )
+
+    await ClaudeChatAdapter.check_endpoint(
+        client=None,
+        base_url={"base_url": "https://api.anthropic.com"},
+        api_key="test-key",
+        request_data={
+            "model": "claude-sonnet-4-5-20250929",
+            "messages": [{"role": "user", "content": "hello"}],
+            "max_tokens": 32,
+            "stream": False,
+        },
+    )
+
+    assert captured["url"] == "https://api.anthropic.com/v1/messages"
+    assert isinstance(captured["json_body"], dict)
+
+
+@pytest.mark.asyncio
+async def test_check_endpoint_accepts_url_key_in_base_url_dict(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    captured: dict[str, object] = {}
+
+    async def fake_run_endpoint_check(**kwargs):
+        captured.update(kwargs)
+        return {"status_code": 200, "headers": {}, "response_time_ms": 1, "request_id": "test"}
+
+    monkeypatch.setattr(
+        "src.api.handlers.base.endpoint_checker.run_endpoint_check",
+        fake_run_endpoint_check,
+    )
+
+    await ClaudeChatAdapter.check_endpoint(
+        client=None,
+        base_url={"url": "https://api.anthropic.com/v1"},
+        api_key="test-key",
+        request_data={
+            "model": "claude-sonnet-4-5-20250929",
+            "messages": [{"role": "user", "content": "hello"}],
+            "max_tokens": 32,
+            "stream": False,
+        },
+    )
+
+    assert captured["url"] == "https://api.anthropic.com/v1/messages"