docs: add missing past_incident and external_create to feature matrix

Verified against offering_test.go — added 2 Pro-only features that were
missing from the comparison table: past incident history and external
incident creation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ysyneu

en/platform/pricing.mdx

@@ -47,8 +47,10 @@ Each License corresponds to one account member. Only members with a License can
 | **Custom notification templates** | ❌ | ❌ | ✅ |
 | **Custom schedule roles** | ❌ | ❌ | ✅ |
 | **Advanced label enrichment** | ❌ | ❌ | ✅ |
+| **Past incident history** | ❌ | ❌ | ✅ |
 | **Outlier incident detection** | ❌ | ❌ | ✅ |
 | **Intelligent alert grouping** | ❌ | ❌ | ✅ |
+| **External incident creation** | ❌ | ❌ | ✅ |
 | **Post-mortem** | ❌ | ❌ | ✅ |
 | **Status page** | ❌ | ❌ | ✅ |
 | **AI incident summary** | ❌ | ❌ | ✅ |

zh/platform/pricing.mdx

@@ -47,8 +47,10 @@ On-call 采用 **License 订阅制**收费，按活跃用户数量计费。
 | **自定义通知模板** | ❌ | ❌ | ✅ |
 | **自定义值班角色** | ❌ | ❌ | ✅ |
 | **高级标签增强** | ❌ | ❌ | ✅ |
+| **历史故障查询** | ❌ | ❌ | ✅ |
 | **新奇故障识别** | ❌ | ❌ | ✅ |
 | **智能告警分组** | ❌ | ❌ | ✅ |
+| **外部创建故障** | ❌ | ❌ | ✅ |
 | **故障复盘** | ❌ | ❌ | ✅ |
 | **状态页** | ❌ | ❌ | ✅ |
 | **AI 故障摘要** | ❌ | ❌ | ✅ |