feat: multi-gateway profile support, provider management overhaul, and model settings tab

- Profile-aware proxy: inject API key from profile-specific .env, route requests via X-Hermes-Profile header
- Remove auth.json dependency: built-in providers use .env, custom providers use config.yaml
- Add allProviders field to available-models response with all hardcoded provider catalogs
- Add Models tab in Settings for editing provider API keys (built-in → .env, custom → config.yaml)
- Add PUT /api/config/providers/:poolKey for updating provider credentials
- ProviderFormModal uses backend allProviders for preset dropdown
- Gateway log format support: parse both agent and gateway log formats
- Add webui server.log to log viewer with log rotation at 3MB
- Fix provider delete loading state and OAuth provider cleanup
- Setup script: require Node.js 23+, auto-upgrade if version too low

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

packages/client/src/i18n/locales/en.ts

@@ -306,6 +306,15 @@ export default {
       session: 'Session',
       privacy: 'Privacy',
       apiServer: 'API Server',
+      models: 'Models',
+    },
+    models: {
+      apiKey: 'API Key',
+      apiKeyPlaceholder: 'Enter API key',
+      save: 'Save',
+      saved: 'Saved',
+      saveFailed: 'Save failed',
+      noProviders: 'No providers configured',
     },
     display: {
       streaming: 'Stream Responses',

packages/client/src/i18n/locales/zh.ts

@@ -298,6 +298,15 @@ export default {
       session: '会话',
       privacy: '隐私',
       apiServer: 'API 服务器',
+      models: '模型',
+    },
+    models: {
+      apiKey: 'API Key',
+      apiKeyPlaceholder: '输入 API Key',
+      save: '保存',
+      saved: '已保存',
+      saveFailed: '保存失败',
+      noProviders: '暂无已配置的模型',
     },
     display: {
       streaming: '流式响应',