fix moderation key handling and key UI

frontend/src/i18n/locales/en.ts

@@ -2348,13 +2348,25 @@ export default {
       apiKeys: 'OpenAI API Keys',
       apiKeyCount: '{count} keys',
       apiKeyPlaceholder: 'Enter API Key',
-      apiKeysPlaceholder: 'One API Key per line',
-      apiKeysPlaceholderKeep: 'Leave empty to keep stored keys; enter values to replace them',
-      apiKeysHint: '{count} keys are currently stored. Values entered here replace stored keys; leave empty to keep them.',
+      apiKeysPlaceholder: 'Add API Keys, one per line. They will be appended on save.',
+      apiKeysPlaceholderReplace: 'Replace API Keys, one per line. Stored keys will be replaced on save.',
+      apiKeysPlaceholderKeep: 'Add API Keys, one per line. They will be appended on save.',
+      apiKeysHint: '{count} keys are currently stored. This input only adds keys; save appends and de-duplicates them.',
+      apiKeysWriteMode: 'Write mode',
+      apiKeysModeAppend: 'Add',
+      apiKeysModeReplace: 'Replace',
+      apiKeysModeAppendHint: 'Default: save appends input keys and keeps stored keys.',
+      apiKeysModeReplaceHint: 'Replace mode: save replaces all stored keys with input keys.',
+      apiKeysReplaceWarning: 'Replace mode',
+      apiKeysReplaceNoInput: 'Replace mode requires at least 1 API Key',
       apiKeyPlaceholderKeep: 'Leave empty to keep current key',
       apiKeyWillClear: 'Configured key will be cleared on save',
       apiKeyConfigured: 'Configured',
       apiKeyTemporary: 'Pending',
+      apiKeyPendingDelete: 'Pending delete',
+      apiKeyPendingDeleteCount: '{count} keys pending deletion',
+      deleteApiKey: 'Delete this key',
+      undoDeleteApiKey: 'Undo delete',
       inputApiKeyCount: '{count} keys in input',
       storedApiKeyCount: '{count} stored keys',
       testInputApiKeys: 'Test input keys',
@@ -2365,8 +2377,12 @@ export default {
       apiKeyTestDone: 'Key test completed for {count} keys',
       apiKeyTestFailed: 'Failed to test OpenAI API Keys',
       apiKeyHealth: 'Key Availability',
-      apiKeyFreezeRule: 'Three consecutive failures freeze a key for 1 minute; moderation rotation skips frozen keys.',
+      apiKeyFreezeRule: '400 does not freeze; 401/403 freeze for 10 minutes; 429/529 freeze for 1 minute; other HTTP errors freeze for 10 seconds.',
       apiKeyRows: '{count} keys',
+      apiKeyRowsCollapsed: '{count} keys hidden',
+      apiKeyRowsExpanded: 'Showing all {count} keys',
+      expandApiKeyRows: 'Expand',
+      collapseApiKeyRows: 'Collapse',
       apiKeyHealthEmpty: 'No key status yet',
       apiKeyHealthEmptyHint: 'Save keys or test input keys to see availability.',
       apiKeyStatusOk: 'Available',
@@ -2383,7 +2399,7 @@ export default {
       auditTestInputHint: 'Enter a prompt and upload or paste images; images are sent as base64 and are not stored.',
       auditTestPromptPlaceholder: 'Enter a user prompt to test; leave empty to only test key availability.',
       auditTestImages: 'Test Images',
-      auditTestImagesHint: 'Upload, drag, or paste images. Up to 4 images, 8MB each.',
+      auditTestImagesHint: 'Upload, drag, or paste images. Up to 1 image, 8MB each.',
       addAuditTestImage: 'Add image',
       clearAuditTest: 'Clear test',
       auditTestImageLimit: 'You can add up to {count} test images',

frontend/src/i18n/locales/zh.ts

@@ -2425,13 +2425,25 @@ export default {
       apiKeys: 'OpenAI API Keys',
       apiKeyCount: '{count} 个 Key',
       apiKeyPlaceholder: '请输入 API Key',
-      apiKeysPlaceholder: '每行一个 API Key',
-      apiKeysPlaceholderKeep: '留空保持已保存的 Key；填写后将替换为这些 Key',
-      apiKeysHint: '当前已保存 {count} 个 Key；填写文本框会替换已保存 Key，留空则保持不变。',
+      apiKeysPlaceholder: '新增 API Key，每行一个；保存后会追加到已保存 Key',
+      apiKeysPlaceholderReplace: '覆盖保存 API Key，每行一个；保存后会替换全部已保存 Key',
+      apiKeysPlaceholderKeep: '新增 API Key，每行一个；保存后会追加到已保存 Key',
+      apiKeysHint: '当前已保存 {count} 个 Key；输入区只用于新增，保存时会增量追加并自动去重。',
+      apiKeysWriteMode: '写入方式',
+      apiKeysModeAppend: '增量添加',
+      apiKeysModeReplace: '覆盖保存',
+      apiKeysModeAppendHint: '默认模式：保存时追加输入区 Key，并保留已保存 Key。',
+      apiKeysModeReplaceHint: '覆盖模式：保存时用输入区 Key 替换全部已保存 Key。',
+      apiKeysReplaceWarning: '覆盖模式',
+      apiKeysReplaceNoInput: '覆盖保存至少需要输入 1 个 API Key',
       apiKeyPlaceholderKeep: '留空保持不变',
       apiKeyWillClear: '保存后清除已配置 Key',
       apiKeyConfigured: '已配置',
       apiKeyTemporary: '待保存',
+      apiKeyPendingDelete: '待删除',
+      apiKeyPendingDeleteCount: '待删除 {count} 个 Key',
+      deleteApiKey: '删除这个 Key',
+      undoDeleteApiKey: '撤销删除',
       inputApiKeyCount: '输入区 {count} 个 Key',
       storedApiKeyCount: '已保存 {count} 个 Key',
       testInputApiKeys: '测试输入区 Key',
@@ -2442,8 +2454,12 @@ export default {
       apiKeyTestDone: 'Key 测试完成，共 {count} 个',
       apiKeyTestFailed: '测试 OpenAI API Key 失败',
       apiKeyHealth: 'Key 可用状态',
-      apiKeyFreezeRule: '连续 3 次失败会冻结 1 分钟，审计轮询会自动跳过。',
-      apiKeyRows: '{count} 个',
+      apiKeyFreezeRule: '400 不冻结；401/403 冻结 10 分钟；429/529 冻结 1 分钟；其他 HTTP 错误冻结 10 秒。',
+      apiKeyRows: '{count} 个 Key',
+      apiKeyRowsCollapsed: '已隐藏 {count} 个 Key',
+      apiKeyRowsExpanded: '正在显示全部 {count} 个 Key',
+      expandApiKeyRows: '展开',
+      collapseApiKeyRows: '收起',
       apiKeyHealthEmpty: '暂无 Key 状态',
       apiKeyHealthEmptyHint: '保存 Key 或测试输入区 Key 后会显示可用性。',
       apiKeyStatusOk: '可用',
@@ -2460,7 +2476,7 @@ export default {
       auditTestInputHint: '可填写提示词并上传或粘贴图片；图片以 base64 发送，不会保存文件。',
       auditTestPromptPlaceholder: '输入要测试的用户提示词；留空时仅测试 Key 可用性。',
       auditTestImages: '测试图片',
-      auditTestImagesHint: '支持上传、拖拽或粘贴图片，最多 4 张，每张不超过 8MB。',
+      auditTestImagesHint: '支持上传、拖拽或粘贴图片，最多 1 张，每张不超过 8MB。',
       addAuditTestImage: '添加图片',
       clearAuditTest: '清空试跑',
       auditTestImageLimit: '最多只能添加 {count} 张测试图片',