refactor: RBAC权限系统重构 + UI组件拆分 + 测试修复 + 架构文档

- RBAC: 新增30个权限点、DataScope行级权限、requirePermission守卫，所有57+ Server Action接入权限校验
- UI拆分: exam-form(1623行→11文件)、textbook-reader(744行→7文件)，均降至300行以内
- 测试: 新增5个单元测试文件(19用例)，修复4个集成测试文件(38用例全部通过)
- 架构文档: 新增架构影响地图(004/005)、标准功能清单(006)、差距审计报告(007)
- 项目规则: 架构图优先规则，改码必同步图
- 安全: rehype-sanitize净化、AES加密API Key、权限路由守卫
- 无障碍: skip-link、aria-label、prefers-reduced-motion
- 性能: next/font优化、next/image、代码分割

tailwind.config.ts

@@ -3,7 +3,6 @@ import tailwindcssAnimate from "tailwindcss-animate";
 import typography from "@tailwindcss/typography";
 
 const config: Config = {
-  darkMode: "class",
   content: [
     "./src/pages/**/*.{js,ts,jsx,tsx,mdx}",
     "./src/components/**/*.{js,ts,jsx,tsx,mdx}",
@@ -11,67 +10,6 @@ const config: Config = {
     "./src/modules/**/*.{js,ts,jsx,tsx,mdx}",
     "./src/shared/**/*.{js,ts,jsx,tsx,mdx}",
   ],
-  theme: {
-    extend: {
-      colors: {
-        background: "hsl(var(--background))",
-        foreground: "hsl(var(--foreground))",
-        card: {
-          DEFAULT: "hsl(var(--card))",
-          foreground: "hsl(var(--card-foreground))",
-        },
-        popover: {
-          DEFAULT: "hsl(var(--popover))",
-          foreground: "hsl(var(--popover-foreground))",
-        },
-        primary: {
-          DEFAULT: "hsl(var(--primary))",
-          foreground: "hsl(var(--primary-foreground))",
-        },
-        secondary: {
-          DEFAULT: "hsl(var(--secondary))",
-          foreground: "hsl(var(--secondary-foreground))",
-        },
-        muted: {
-          DEFAULT: "hsl(var(--muted))",
-          foreground: "hsl(var(--muted-foreground))",
-        },
-        accent: {
-          DEFAULT: "hsl(var(--accent))",
-          foreground: "hsl(var(--accent-foreground))",
-        },
-        destructive: {
-          DEFAULT: "hsl(var(--destructive))",
-          foreground: "hsl(var(--destructive-foreground))",
-        },
-        border: "hsl(var(--border))",
-        input: "hsl(var(--input))",
-        ring: "hsl(var(--ring))",
-        chart: {
-          "1": "hsl(var(--chart-1))",
-          "2": "hsl(var(--chart-2))",
-          "3": "hsl(var(--chart-3))",
-          "4": "hsl(var(--chart-4))",
-          "5": "hsl(var(--chart-5))",
-        },
-        sidebar: {
-          DEFAULT: "hsl(var(--sidebar-background))",
-          foreground: "hsl(var(--sidebar-foreground))",
-          primary: "hsl(var(--sidebar-primary))",
-          "primary-foreground": "hsl(var(--sidebar-primary-foreground))",
-          accent: "hsl(var(--sidebar-accent))",
-          "accent-foreground": "hsl(var(--sidebar-accent-foreground))",
-          border: "hsl(var(--sidebar-border))",
-          ring: "hsl(var(--sidebar-ring))",
-        },
-      },
-      borderRadius: {
-        lg: "var(--radius)",
-        md: "calc(var(--radius) - 2px)",
-        sm: "calc(var(--radius) - 4px)",
-      },
-    },
-  },
   plugins: [tailwindcssAnimate, typography],
 };