feat(test,quota,failover): 模型并发测试、统一配额读取器与故障转移取消支持

- 新增 QuotaReader 抽象层，统一 Codex/Kiro/Antigravity 配额解析逻辑，
  替换 pool/routes.py 中分散的配额构建函数
- 模型测试支持并发执行多候选，前端新增 useModelTest composable 统一
  ModelsTab 和 ModelMappingTab 的测试逻辑
- ModelTestDialog 增加结果概览摘要、超长结果折叠、端点列和新状态支持，
  删除已合并的 TestResultDialog
- FailoverEngine 新增客户端断开检测，支持取消剩余候选并标记记录
- 刷新配额改为分批执行，直连测试候选按可用性排序
- 修复 error 判断从 "error" in dict 改为 dict.get("error") 避免误判

tests/services/test_quota_reader.py

@@ -0,0 +1,109 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+import pytest
+
+from src.services.provider.pool.account_state import resolve_pool_account_state
+from src.services.provider.pool.dimensions._helpers import (
+    extract_plan_type,
+    extract_reset_seconds,
+    extract_usage_ratio,
+)
+from src.services.provider_keys import quota_reader
+from src.services.provider_keys.quota_reader import get_quota_reader
+from src.services.scheduling.quota_skipper import is_key_quota_exhausted
+
+
+def test_codex_reader_preserves_summary_formats() -> None:
+    reader = get_quota_reader(
+        "codex",
+        {
+            "codex": {
+                "primary_used_percent": 14.8,
+                "primary_reset_seconds": 266400,
+                "secondary_used_percent": 27.9,
+            }
+        },
+    )
+
+    assert reader.display_summary() == "周剩余 85.2% (3天2小时后重置) | 5H剩余 72.1%"
+
+    credits_reader = get_quota_reader(
+        "codex",
+        {"codex": {"has_credits": True, "credits_balance": 12.345}},
+    )
+    assert credits_reader.display_summary() == "积分 12.35"
+
+
+def test_antigravity_reader_keeps_used_percent_fallbacks() -> None:
+    reader = get_quota_reader(
+        "antigravity",
+        {
+            "antigravity": {
+                "quota_by_model": {
+                    "claude-sonnet-4": {"used_percent": 100.0},
+                    "gemini-2.5-pro": {"remaining_fraction": 0.6},
+                }
+            }
+        },
+    )
+
+    exhausted = reader.is_exhausted("claude-sonnet-4")
+    assert exhausted.exhausted is True
+    assert exhausted.reason == "Antigravity 模型 claude-sonnet-4 配额剩余 0%"
+    assert reader.display_summary() == "最低剩余 0.0% (2 模型)"
+    assert reader.usage_ratio() == pytest.approx(0.7)
+
+
+def test_dimension_helpers_delegate_to_unified_reader(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setattr(quota_reader.time, "time", lambda: 100.0)
+    key_obj = SimpleNamespace(
+        upstream_metadata={
+            "kiro": {
+                "next_reset_at": 160.0,
+                "usage_percentage": 45.0,
+                "subscription_title": "Kiro Team",
+            }
+        },
+        oauth_plan_type=None,
+    )
+
+    assert extract_plan_type(key_obj) == "team"
+    assert extract_reset_seconds(key_obj) == pytest.approx(60.0)
+    assert extract_usage_ratio(key_obj) == pytest.approx(0.45)
+
+
+def test_resolve_pool_account_state_keeps_codex_metadata_block() -> None:
+    state = resolve_pool_account_state(
+        provider_type="codex",
+        upstream_metadata={"codex": {"account_disabled": True, "message": "deactivated_workspace"}},
+        oauth_invalid_reason=None,
+    )
+
+    assert state.blocked is True
+    assert state.code == "account_forbidden"
+    assert state.label == "访问受限"
+    assert state.reason == "deactivated_workspace"
+
+
+def test_quota_skipper_uses_unified_reader() -> None:
+    codex_key = SimpleNamespace(
+        upstream_metadata={"codex": {"primary_used_percent": 100.0, "secondary_used_percent": 20.0}}
+    )
+    exhausted, reason = is_key_quota_exhausted("codex", codex_key, model_name="")  # type: ignore[arg-type]
+    assert exhausted is True
+    assert reason == "Codex 周限额剩余 0%"
+
+    antigravity_key = SimpleNamespace(
+        upstream_metadata={
+            "antigravity": {"quota_by_model": {"gemini-2.5-pro": {"remaining_fraction": 0.0}}}
+        }
+    )
+    exhausted, reason = is_key_quota_exhausted(
+        "antigravity",
+        antigravity_key,  # type: ignore[arg-type]
+        model_name="gemini-2.5-pro",
+    )
+    assert exhausted is True
+    assert reason == "Antigravity 模型 gemini-2.5-pro 配额剩余 0%"