style(test): 格式化 test_router_executor 中的代码缩进;

🤖 Generated with [Claude Code](https://github.com/claude), [CodeX](https://openai.com), [Gemini](https://github.com/apps/gemini-code-assist)
Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>

Author: ThreeFish-AI

tests/test_router_executor.py

@@ -1049,11 +1049,13 @@ async def test_multi_tier_429_cascade(self):
             )
         )
 
-        exec_inst = _executor([
-            _make_tier(anthropic),
-            _make_tier(zhipu),
-            _make_tier(copilot),
-        ])
+        exec_inst = _executor(
+            [
+                _make_tier(anthropic),
+                _make_tier(zhipu),
+                _make_tier(copilot),
+            ]
+        )
         resp = await exec_inst.execute_message({"model": "claude-opus-4-6"}, {})
 
         assert resp.status_code == 200