feat: 任务详情 LLM 请求数（cost_records 存 completions）

cloud/tests/test_models_cost.py

@@ -140,7 +140,8 @@ class TestCostStore(unittest.TestCase):
     def test_record_computes_total_and_day(self):
         row_id = self.store.record(
             "t1", "p1", "gpt-6.1-sol", input_tokens=100, output_tokens=50,
-            usd_micros=2000, source="actual", fallback_count=1)
+            usd_micros=2000, source="actual", fallback_count=1,
+            completions=7)
         self.assertIsInstance(row_id, int)
         report = self.store.report_by_task("t1")
         self.assertEqual(report["total_tokens"], 150)
@@ -149,6 +150,16 @@ class TestCostStore(unittest.TestCase):
         self.assertEqual(report["fallback_count"], 1)
         self.assertEqual(report["actual_tokens"], 150)
         self.assertEqual(report["estimated_tokens"], 0)
+        self.assertEqual(report["llm_requests"], 7)
+
+    def test_llm_requests_sums_completions_not_turns(self):
+        self.store.record("t1", "p1", "m", input_tokens=10,
+                          output_tokens=0, source="actual", completions=3)
+        self.store.record("t1", "p1", "m", input_tokens=20,
+                          output_tokens=0, source="actual", completions=5)
+        report = self.store.report_by_task("t1")
+        self.assertEqual(report["turns"], 2)
+        self.assertEqual(report["llm_requests"], 8)
 
     def test_invalid_source_rejected(self):
         with self.assertRaises(ValueError):
@@ -196,6 +207,7 @@ class TestCostStore(unittest.TestCase):
             "estimated_tokens": 0,
             "cached_input_tokens": 0,
             "unpriced_actual_tokens": 0,
+            "llm_requests": 0,
         })