feat: 评测任务完成进度收尾与指标维度汇总展示

- platform_store: 评测任务完成时置进度 100% 并落地 completed_time
- eval_runner: 新增指标维度汇总，供雷达图等维度展示
- 前端: 评测详情/列表展示优化、模型管理增强

backend/app/db/platform_store.py

@@ -3361,6 +3361,32 @@ class PlatformStore:
             })
             if new_status == "completed":
                 updates["completed_time"] = utcnow()
+        if new_status == "completed":
+            final_total = int(
+                (result_content or {}).get("sample_count")
+                or task.get("sample_count")
+                or (progress_detail or {}).get("total")
+                or 0
+            )
+            final_completed = int(
+                (result_content or {}).get("completed_count")
+                or task.get("completed_count")
+                or final_total
+            )
+            updates.update({
+                "progress": 100,
+                "progress_detail": {
+                    **progress_detail,
+                    "status": "completed",
+                    "stage": "completed",
+                    "total": final_total,
+                    "completed": max(final_completed, final_total),
+                    "percentage": 100,
+                    "current_index": final_total,
+                    "message": "评测完成",
+                },
+                "completed_time": utcnow(),
+            })
         elif new_status in {"failed", "stopped"}:
             updates.update({
                 "error": job.get("error") or task.get("error") or "",