feat(admin,pool,billing): 端点级模型测试、Provider 自动置顶、缓存 TTL 分级计费展示与账号状态增强

- 模型测试支持指定端点：新增 ModelTestDialog 组件，多端点时弹窗选择，单端点直接测试；
  后端 test-model-failover 接口新增 endpoint_id 参数，支持 global/direct 模式下按端点过滤候选
- 创建 Provider 时优先级自动置顶（provider_priority 默认 None，后端取 min-1），
  显式指定优先级时 shift 已有行；前端创建时不发送 priority，更新时保留
- 缓存计费 UI 增强：RequestDetailDrawer 支持 5min/1h 缓存创建 token 分级展示，
  含按 TTL 匹配单价和分行成本计算；ModelDetailDrawer/ModelsTab 标签区分 5min/1h 缓存创建
- Pool 批量操作额度筛选拆分为「无5H限额」和「无周限额」，按 | 分隔 segment 匹配
- KeyFormDialog 优化非 vertex_ai 时布局，API 密钥输入内联到 grid 右列
- Codex refresher 结构化错误标记：401/402/403 使用 [OAUTH_EXPIRED]/[ACCOUNT_BLOCK] 前缀，
  新增 deactivated_workspace 识别与分类
- 前后端 accountBlock 关键词同步：新增 token invalidated、deactivated_workspace 识别，
  OAuth 失效提示清理 block 前缀后展示
- PoolConfig 新增 batch_concurrency 配置（默认 8，上限 32）
- 预设模型新增 gpt-5.4；TestResultDialog 响应式布局与 key 脱敏优化

tests/unit/test_provider_query_failover_endpoint.py

@@ -0,0 +1,38 @@
+from types import SimpleNamespace
+
+from src.api.admin.provider_query import (
+    _build_direct_test_candidates,
+    _filter_test_candidates_by_endpoint,
+)
+
+
+def _build_provider() -> tuple[SimpleNamespace, SimpleNamespace, SimpleNamespace]:
+    endpoint_a = SimpleNamespace(id="ep-a", api_format="openai:chat", is_active=True)
+    endpoint_b = SimpleNamespace(id="ep-b", api_format="claude:cli", is_active=True)
+    key_all = SimpleNamespace(
+        id="key-all", is_active=True, api_formats=["openai:chat", "claude:cli"]
+    )
+    key_b = SimpleNamespace(id="key-b", is_active=True, api_formats=["claude:cli"])
+    provider = SimpleNamespace(
+        id="provider-1", endpoints=[endpoint_a, endpoint_b], api_keys=[key_all, key_b]
+    )
+    return provider, endpoint_a, endpoint_b
+
+
+def test_build_direct_test_candidates_respects_endpoint_id() -> None:
+    provider, _endpoint_a, endpoint_b = _build_provider()
+
+    candidates = _build_direct_test_candidates(provider, endpoint_id=endpoint_b.id)  # type: ignore[arg-type]
+
+    assert {candidate.endpoint.id for candidate in candidates} == {endpoint_b.id}
+    assert {candidate.key.id for candidate in candidates} == {"key-all", "key-b"}
+
+
+def test_filter_test_candidates_by_endpoint_keeps_matching_candidates() -> None:
+    provider, endpoint_a, endpoint_b = _build_provider()
+    candidates = _build_direct_test_candidates(provider)  # type: ignore[arg-type]
+
+    filtered = _filter_test_candidates_by_endpoint(candidates, endpoint_a.id)
+
+    assert {candidate.endpoint.id for candidate in filtered} == {endpoint_a.id}
+    assert all(candidate.endpoint.id != endpoint_b.id for candidate in filtered)