perf(pool): 添加性能计时日志，优化批量删除分批与模型解除关联查询

- 前端批量操作对话框添加 loadAllKeys/executeAction 计时日志
- 后端池账号列表接口和批量删除接口添加分阶段耗时日志
- 批量删除按数据库类型自动选择分批大小，统一前端 batch size 为 2000
- 优化 auto_disassociate 查询：先检查 unlimited key 提前返回，使用 load_only 减少字段加载
- 新增批量操作路由和自动解除关联的单元测试

tests/api/test_admin_pool_batch_action_routes.py

@@ -0,0 +1,94 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from src.api.admin.pool.routes import AdminBatchActionKeysAdapter
+from src.api.admin.pool.schemas import BatchActionRequest
+
+
+def _build_context(db: MagicMock) -> SimpleNamespace:
+    return SimpleNamespace(
+        db=db,
+        user=SimpleNamespace(username="admin-1"),
+        add_audit_metadata=lambda **_: None,
+    )
+
+
+def _mock_provider_lookup(db: MagicMock, provider_id: str) -> None:
+    db.query.return_value.filter.return_value.first.return_value = SimpleNamespace(id=provider_id)
+
+
+@pytest.mark.asyncio
+async def test_batch_delete_uses_single_statement_for_non_sqlite(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    db = MagicMock()
+    provider_id = "provider-1"
+    _mock_provider_lookup(db, provider_id)
+    db.get_bind.return_value = SimpleNamespace(dialect=SimpleNamespace(name="postgresql"))
+    db.execute.return_value = SimpleNamespace(rowcount=1200)
+    side_effect = AsyncMock()
+    monkeypatch.setattr(
+        "src.services.provider_keys.key_side_effects.run_delete_key_side_effects",
+        side_effect,
+    )
+
+    adapter = AdminBatchActionKeysAdapter(
+        provider_id=provider_id,
+        body=BatchActionRequest(
+            key_ids=[f"key-{idx}" for idx in range(1200)],
+            action="delete",
+        ),
+    )
+
+    result = await adapter.handle(_build_context(db))
+
+    assert result.affected == 1200
+    assert db.execute.call_count == 1
+    db.commit.assert_called_once()
+    side_effect.assert_awaited_once_with(
+        db=db,
+        provider_id=provider_id,
+        deleted_key_allowed_models=None,
+    )
+
+
+@pytest.mark.asyncio
+async def test_batch_delete_chunks_sqlite_and_runs_side_effect_once(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    db = MagicMock()
+    provider_id = "provider-2"
+    _mock_provider_lookup(db, provider_id)
+    db.get_bind.return_value = SimpleNamespace(dialect=SimpleNamespace(name="sqlite"))
+    db.execute.side_effect = [
+        SimpleNamespace(rowcount=900),
+        SimpleNamespace(rowcount=300),
+    ]
+    side_effect = AsyncMock()
+    monkeypatch.setattr(
+        "src.services.provider_keys.key_side_effects.run_delete_key_side_effects",
+        side_effect,
+    )
+
+    adapter = AdminBatchActionKeysAdapter(
+        provider_id=provider_id,
+        body=BatchActionRequest(
+            key_ids=[f"key-{idx}" for idx in range(1200)],
+            action="delete",
+        ),
+    )
+
+    result = await adapter.handle(_build_context(db))
+
+    assert result.affected == 1200
+    assert db.execute.call_count == 2
+    db.commit.assert_called_once()
+    side_effect.assert_awaited_once_with(
+        db=db,
+        provider_id=provider_id,
+        deleted_key_allowed_models=None,
+    )