feat(pool): 增加 OAuth 账号池管理功能

- 新增 pool manager / strategy / health_policy / cost_tracker / redis_ops 等核心模块
- 新增 pool admin API 路由与 schemas
- 新增 OAuth 账号类型解析 (oauth_plan)
- 前端增加 PoolManagement 页面、PoolConfigDialog、PoolImportDialog、PoolStatusCard 组件
- 补充 pool config / cost tracker / health policy / manager / strategy / trace 等测试

tests/services/test_pool_cost_tracker.py

@@ -0,0 +1,141 @@
+"""Tests for pool_cost_tracker.py — rolling window cost tracking."""
+
+from __future__ import annotations
+
+from unittest.mock import AsyncMock, patch
+
+import pytest
+
+from src.services.provider.pool.config import PoolConfig
+from src.services.provider.pool.cost_tracker import (
+    get_window_usage,
+    is_approaching_limit,
+    is_at_limit,
+    record_usage,
+)
+
+PID = "provider-test"
+KID = "key-test"
+
+
+@pytest.fixture()
+def config() -> PoolConfig:
+    return PoolConfig(
+        cost_limit_per_key_tokens=10000,
+        cost_soft_threshold_percent=80,
+        cost_window_seconds=18000,
+    )
+
+
+@pytest.fixture()
+def config_no_limit() -> PoolConfig:
+    return PoolConfig(cost_limit_per_key_tokens=None)
+
+
+# ---------------------------------------------------------------------------
+# record_usage
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_record_usage_calls_redis(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.add_cost_entry",
+        new_callable=AsyncMock,
+    ) as mock_add:
+        await record_usage(PID, KID, 500, config)
+
+    mock_add.assert_called_once_with(PID, KID, 500, 18000)
+
+
+@pytest.mark.asyncio
+async def test_record_usage_skips_zero_tokens(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.add_cost_entry",
+        new_callable=AsyncMock,
+    ) as mock_add:
+        await record_usage(PID, KID, 0, config)
+
+    mock_add.assert_not_called()
+
+
+@pytest.mark.asyncio
+async def test_record_usage_skips_when_no_limit(config_no_limit: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.add_cost_entry",
+        new_callable=AsyncMock,
+    ) as mock_add:
+        await record_usage(PID, KID, 500, config_no_limit)
+
+    mock_add.assert_not_called()
+
+
+# ---------------------------------------------------------------------------
+# is_at_limit
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_is_at_limit_true(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.get_cost_window_total",
+        new_callable=AsyncMock,
+        return_value=10000,
+    ):
+        assert await is_at_limit(PID, KID, config) is True
+
+
+@pytest.mark.asyncio
+async def test_is_at_limit_false(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.get_cost_window_total",
+        new_callable=AsyncMock,
+        return_value=5000,
+    ):
+        assert await is_at_limit(PID, KID, config) is False
+
+
+@pytest.mark.asyncio
+async def test_is_at_limit_always_false_when_no_limit(config_no_limit: PoolConfig) -> None:
+    assert await is_at_limit(PID, KID, config_no_limit) is False
+
+
+# ---------------------------------------------------------------------------
+# is_approaching_limit
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_is_approaching_limit_true(config: PoolConfig) -> None:
+    # 80% of 10000 = 8000
+    with patch(
+        "src.services.provider.pool.redis_ops.get_cost_window_total",
+        new_callable=AsyncMock,
+        return_value=8500,
+    ):
+        assert await is_approaching_limit(PID, KID, config) is True
+
+
+@pytest.mark.asyncio
+async def test_is_approaching_limit_false(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.get_cost_window_total",
+        new_callable=AsyncMock,
+        return_value=5000,
+    ):
+        assert await is_approaching_limit(PID, KID, config) is False
+
+
+# ---------------------------------------------------------------------------
+# get_window_usage
+# ---------------------------------------------------------------------------
+
+
+@pytest.mark.asyncio
+async def test_get_window_usage(config: PoolConfig) -> None:
+    with patch(
+        "src.services.provider.pool.redis_ops.get_cost_window_total",
+        new_callable=AsyncMock,
+        return_value=4200,
+    ):
+        assert await get_window_usage(PID, KID, config) == 4200