refactor: 优化 kiro token 刷新逻辑和 build_all_format_configs

- kiro auth: 拆分无缓存 token 和占位符 key 的判断逻辑，避免不必要的解密操作
- kiro auth: 简化 effective_token 获取逻辑
- build_all_format_configs: 只对实际配置了端点的格式构建请求配置，
  不再用某个端点的 base_url 尝试其他未配置的格式
- get_adapter_for_format: 简化为单行表达式
- 修复 f-string 日志为 loguru 风格占位符
- 新增 build_all_format_configs 单元测试

tests/services/test_build_all_format_configs.py

@@ -0,0 +1,84 @@
+"""测试 build_all_format_configs 是否正确使用每个端点自身的 base_url。"""
+
+from __future__ import annotations
+
+from types import SimpleNamespace
+
+from src.services.model.upstream_fetcher import build_all_format_configs
+
+
+def _make_endpoint(base_url: str, header_rules: list | None = None) -> SimpleNamespace:
+    """创建一个最小化的 ProviderEndpoint 替身。"""
+    return SimpleNamespace(base_url=base_url, header_rules=header_rules)
+
+
+def test_three_formats_use_their_own_base_url() -> None:
+    """三种格式各有不同的 base_url，结果应各自使用自己的 URL。"""
+    format_to_endpoint = {
+        "openai:chat": _make_endpoint("https://api.openai.example.com"),
+        "claude:chat": _make_endpoint("https://api.claude.example.com"),
+        "gemini:chat": _make_endpoint("https://api.gemini.example.com"),
+    }
+
+    configs = build_all_format_configs("sk-test-key", format_to_endpoint)  # type: ignore[arg-type]
+
+    assert len(configs) == 3
+
+    by_fmt = {c["api_format"]: c for c in configs}
+    assert by_fmt["openai:chat"]["base_url"] == "https://api.openai.example.com"
+    assert by_fmt["claude:chat"]["base_url"] == "https://api.claude.example.com"
+    assert by_fmt["gemini:chat"]["base_url"] == "https://api.gemini.example.com"
+
+    # 所有配置都应使用同一个 api_key
+    for c in configs:
+        assert c["api_key"] == "sk-test-key"
+
+
+def test_only_configured_formats_are_included() -> None:
+    """只配置了 claude:chat，不应出现 openai:chat 和 gemini:chat 的请求。"""
+    format_to_endpoint = {
+        "claude:chat": _make_endpoint("https://betterclau.de/claude/api.freekey.site"),
+    }
+
+    configs = build_all_format_configs("sk-test-key", format_to_endpoint)  # type: ignore[arg-type]
+
+    assert len(configs) == 1
+    assert configs[0]["api_format"] == "claude:chat"
+    assert configs[0]["base_url"] == "https://betterclau.de/claude/api.freekey.site"
+
+
+def test_cli_format_only_is_skipped() -> None:
+    """如果只配置了 CLI 格式（不在 MODEL_FETCH_FORMATS 中），应返回空列表。"""
+    format_to_endpoint = {
+        "openai:cli": _make_endpoint("https://api.openai.example.com"),
+    }
+
+    configs = build_all_format_configs("sk-test-key", format_to_endpoint)  # type: ignore[arg-type]
+
+    assert configs == []
+
+
+def test_empty_format_to_endpoint() -> None:
+    """空映射应返回空列表。"""
+    configs = build_all_format_configs("sk-test-key", {})
+    assert configs == []
+
+
+def test_extra_headers_from_each_endpoint() -> None:
+    """每个端点的 extra_headers 应独立获取，不应混用。"""
+    format_to_endpoint = {
+        "openai:chat": _make_endpoint(
+            "https://api.openai.example.com",
+            header_rules=[{"action": "set", "key": "X-OpenAI", "value": "1"}],
+        ),
+        "claude:chat": _make_endpoint(
+            "https://api.claude.example.com",
+            header_rules=[{"action": "set", "key": "X-Claude", "value": "2"}],
+        ),
+    }
+
+    configs = build_all_format_configs("sk-test-key", format_to_endpoint)  # type: ignore[arg-type]
+
+    by_fmt = {c["api_format"]: c for c in configs}
+    assert by_fmt["openai:chat"]["extra_headers"] == {"X-OpenAI": "1"}
+    assert by_fmt["claude:chat"]["extra_headers"] == {"X-Claude": "2"}