fix(model-resolution): 修复模型解析优先级和别名匹配范围

- 调整 ModelCacheService 解析优先级：优先直接匹配 GlobalModel.name，
  避免被 provider_model_name 误导到错误的 GlobalModel
- 为 check_model_allowed_with_aliases 新增 candidate_models 参数，
  限制别名匹配只能落到 Provider 实际配置的模型名上
- 对 allowed_set 排序以确保别名匹配结果的确定性
- 调整 HTTP_READ_TIMEOUT 默认值从 300s 改为 60s
- 优化 ModelMappingTab 组件布局，将正则表达式提取到 Key 级别展示
- 补充 .env.example 超时配置文档

tests/services/test_model_cache_service.py

@@ -0,0 +1,69 @@
+import pytest
+
+from src.core.cache_service import CacheService
+from src.models.database import GlobalModel, Model
+from src.services.cache.model_cache import ModelCacheService
+
+
+class _FakeQuery:
+    def __init__(self, *, first_result=None, all_result=None, on_all=None):
+        self._first_result = first_result
+        self._all_result = all_result if all_result is not None else []
+        self._on_all = on_all
+
+    def join(self, *_args, **_kwargs):
+        return self
+
+    def filter(self, *_args, **_kwargs):
+        return self
+
+    def first(self):
+        return self._first_result
+
+    def all(self):
+        if self._on_all:
+            self._on_all()
+        return self._all_result
+
+
+class _FakeSession:
+    def __init__(self, *, direct_match: GlobalModel):
+        self._direct_match = direct_match
+
+    def query(self, *entities):
+        if entities == (GlobalModel,):
+            return _FakeQuery(first_result=self._direct_match)
+
+        # 如果 direct match 命中，不应再走 provider_model_name 分支
+        if entities == (Model, GlobalModel):
+            raise AssertionError("provider_model_name query should not run when direct match exists")
+
+        raise AssertionError(f"Unexpected query entities: {entities}")
+
+
+@pytest.mark.asyncio
+async def test_resolve_global_model_prefers_direct_match(monkeypatch) -> None:
+    async def _fake_get(_key: str):
+        return None
+
+    async def _fake_set(_key: str, _value, ttl_seconds: int = 60):  # noqa: ARG001
+        return True
+
+    monkeypatch.setattr(CacheService, "get", staticmethod(_fake_get))
+    monkeypatch.setattr(CacheService, "set", staticmethod(_fake_set))
+
+    global_model = GlobalModel(
+        id="gm-1",
+        name="claude-haiku-4-5-20251001",
+        display_name="Claude Haiku 4.5",
+        supported_capabilities=[],
+        config={},
+        default_tiered_pricing=None,
+        default_price_per_request=None,
+        is_active=True,
+    )
+    db = _FakeSession(direct_match=global_model)
+
+    resolved = await ModelCacheService.resolve_global_model_by_name_or_alias(db, global_model.name)
+    assert resolved is global_model
+