Feat: bedrock iam authentication (#12020)

### What problem does this PR solve?

Feat: bedrock iam authentication #12008 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/en.ts

@@ -785,6 +785,8 @@ This auto-tagging feature enhances retrieval by adding another layer of domain-s
     },
     setting: {
       deleteModel: 'Delete model',
+      bedrockCredentialsHint:
+        'Tip: Leave Access Key / Secret Key blank to use AWS IAM authentication.',
       modelEmptyTip:
         'No models available. <br>Please add models from the panel on the right.',
       sourceEmptyTip: 'No data sources added yet. Select one below to connect.',

web/src/locales/zh-traditional.ts

@@ -544,6 +544,8 @@ export default {
       avatar: '头像',
       avatarTip: '這會在你的個人主頁展示',
       profileDescription: '在此更新您的照片和個人詳細信息。',
+      bedrockCredentialsHint:
+        '提示：Access Key / Secret Key 可留空，以啟用 AWS IAM 自動驗證。',
       maxTokens: '最大token數',
       maxTokensMessage: '最大token數是必填項',
       maxTokensTip:

web/src/locales/zh.ts

@@ -51,6 +51,8 @@ export default {
       search: '搜索',
       noDataFound: '没有找到数据。',
       noData: '暂无数据',
+      bedrockCredentialsHint:
+        '提示：Access Key / Secret Key 可留空，以启用 AWS IAM 自动验证。',
       promptPlaceholder: '请输入或使用 / 快速插入变量。',
       selected: '已选择',
     },