docs: audit reports + feature docs + skills + admin-v2 + config sync

Update audit tracker, roadmap, architecture docs,
add admin-v2 Roles page + Billing tests,
sync CLAUDE.md, Cargo.toml, docker-compose.yml,
add deep-research / frontend-design / chart-visualization skills

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

admin-v2/src/layouts/AdminLayout.tsx

@@ -18,6 +18,7 @@ import {
   ApiOutlined,
   BookOutlined,
   CrownOutlined,
+  SafetyOutlined,
 } from '@ant-design/icons'
 import { Avatar, Dropdown, Tooltip, Drawer } from 'antd'
 import { useAuthStore } from '@/stores/authStore'
@@ -39,6 +40,7 @@ interface NavItem {
 const navItems: NavItem[] = [
   { path: '/', name: '仪表盘', icon: <DashboardOutlined />, group: '核心' },
   { path: '/accounts', name: '账号管理', icon: <TeamOutlined />, permission: 'account:admin', group: '资源管理' },
+  { path: '/roles', name: '角色与权限', icon: <SafetyOutlined />, permission: 'account:admin', group: '资源管理' },
   { path: '/model-services', name: '模型服务', icon: <CloudServerOutlined />, permission: 'provider:manage', group: '资源管理' },
   { path: '/agent-templates', name: 'Agent 模板', icon: <RobotOutlined />, permission: 'model:read', group: '资源管理' },
   { path: '/api-keys', name: 'API 密钥', icon: <ApiOutlined />, permission: 'provider:manage', group: '资源管理' },
@@ -201,6 +203,7 @@ function MobileDrawer({
 const breadcrumbMap: Record<string, string> = {
   '/': '仪表盘',
   '/accounts': '账号管理',
+  '/roles': '角色与权限',
   '/model-services': '模型服务',
   '/providers': '模型服务',
   '/models': '模型服务',