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_config_backward_compat.py

@@ -0,0 +1,54 @@
+"""Tests for pool config backward compatibility.
+
+Verifies that:
+1. Only ``pool_advanced`` key activates pool mode
+2. ``claude_code_advanced`` alone does NOT activate pool mode
+3. Old import paths via shim modules still resolve correctly
+"""
+
+from __future__ import annotations
+
+from src.services.provider.pool.config import PoolConfig, parse_pool_config
+
+
+def test_pool_advanced_key_activates_pool() -> None:
+    """pool_advanced key activates pool mode."""
+    cfg = parse_pool_config({"pool_advanced": {"sticky_session_ttl_seconds": 999}})
+    assert cfg is not None
+    assert cfg.sticky_session_ttl_seconds == 999
+
+
+def test_claude_code_advanced_alone_does_not_activate_pool() -> None:
+    """claude_code_advanced alone does NOT activate pool mode."""
+    cfg = parse_pool_config({"claude_code_advanced": {"lru_enabled": False}})
+    assert cfg is None
+
+
+def test_no_config_returns_none() -> None:
+    cfg = parse_pool_config({"other": 1})
+    assert cfg is None
+
+
+def test_empty_pool_advanced_returns_defaults() -> None:
+    cfg = parse_pool_config({"pool_advanced": {}})
+    assert cfg is not None
+    defaults = PoolConfig()
+    assert cfg.sticky_session_ttl_seconds == defaults.sticky_session_ttl_seconds
+    assert cfg.lru_enabled is True
+
+
+def test_shim_imports_resolve() -> None:
+    """Old import paths through shim modules still work."""
+    from src.services.provider.adapters.claude_code.pool_config import PoolConfig as ShimPoolConfig
+    from src.services.provider.adapters.claude_code.pool_config import (
+        parse_pool_config as shim_parse,
+    )
+    from src.services.provider.adapters.claude_code.pool_manager import (
+        ClaudeCodePoolManager,
+    )
+    from src.services.provider.pool.manager import PoolManager
+
+    # ShimPoolConfig should be the same class
+    assert ShimPoolConfig is PoolConfig
+    assert shim_parse is parse_pool_config
+    assert ClaudeCodePoolManager is PoolManager