fix: 清理残留_qual引用→_cur_regime_q(per-regime改造遗漏导致500)

server.py

@@ -845,7 +845,7 @@ def api_research_strategies():
                 elif not _l_ok:
                     s['state'] = 'unavailable'
                     s['state_reason'] = '长期不合格(10y适应温区年化%s%%<大盘%s%%)' % (
-                        round(_qual['cagr_10y'], 1) if _qual and _qual.get('cagr_10y') is not None else '?',
+                        round(_cur_regime_q['cagr_10y'], 1) if _cur_regime_q and _cur_regime_q.get('cagr_10y') is not None else '?',
                         _qbench_data.get('10y'))
                 elif _qual_ok_2:
                     s['state'] = 'available'
@@ -858,14 +858,14 @@ def api_research_strategies():
                 s['state_reason'] = '不在候选池（历史版本，路由不会选中）'
             # 2026-08-16 警告标记：可用性下降（近期转差）/ 回升（不可用但近期转好）
             s['qual_warning'] = None
-            if _qual and s.get('manual_available'):
+            if _cur_regime_q and s.get('manual_available'):
                 if not _m_ok and _l_ok:
                     s['qual_warning'] = '⚠️近期转差: 2y年化%s%%<大盘%s%%' % (
-                        round(_qual['cagr_2y'], 1) if _qual.get('cagr_2y') is not None else '?',
+                        round(_cur_regime_q['cagr_2y'], 1) if _cur_regime_q.get('cagr_2y') is not None else '?',
                         _qbench_data.get('2y'))
-            if _qual and not s.get('manual_available') and _s_ok:
+            if _cur_regime_q and not s.get('manual_available') and _s_ok:
                 s['qual_warning'] = '🔄近期回升: 1y年化%s%%>大盘%s%%，可考虑重新启用' % (
-                    round(_qual['cagr_1y'], 1) if _qual.get('cagr_1y') is not None else '?',
+                    round(_cur_regime_q['cagr_1y'], 1) if _cur_regime_q.get('cagr_1y') is not None else '?',
                     _qbench_data.get('1y'))
 
         # 2026-08-13 关键修复：激活策略必须始终在列表中（即使该 period 无回测记录）