fix: enforce subagent prompt files and refine webui

webui/src/i18n/index.ts

@@ -108,6 +108,7 @@ const resources = {
       subagentDeleteConfirmMessage: 'Delete subagent profile "{{id}}" permanently?',
       sidebarCore: 'Core',
       sidebarMain: 'Main',
+      sidebarAgents: 'Agents',
       sidebarRuntime: 'Runtime',
       sidebarConfig: 'Configuration',
       sidebarKnowledge: 'Knowledge',
@@ -726,6 +727,7 @@ const resources = {
       subagentDeleteConfirmMessage: '确认永久删除子代理档案 "{{id}}"？',
       sidebarCore: '核心',
       sidebarMain: '主入口',
+      sidebarAgents: 'Agents',
       sidebarRuntime: '运行态',
       sidebarConfig: '配置',
       sidebarKnowledge: '知识与调试',