feat: 实现系统管理用户、角色与权限配置页面

补齐 RBAC 相关页面与 UI 设计图，并接入功能与视觉回归测试，便于后续持续验证。

Co-authored-by: Cursor <cursoragent@cursor.com>

e2e/visual/system-permission.spec.ts

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+import { expect, test } from '../fixtures/auth';
+
+test('权限配置视觉基线', async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 900 });
+  await page.goto('/system/permission');
+  await page.getByText('菜单树', { exact: true }).waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('system-permission.png', {
+    fullPage: true,
+  });
+});

e2e/visual/system-roles.spec.ts

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+import { expect, test } from '../fixtures/auth';
+
+test('角色管理视觉基线', async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 900 });
+  await page.goto('/system/role');
+  await page.getByRole('table').waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('system-roles-list.png', {
+    fullPage: true,
+  });
+});

e2e/visual/system-users.spec.ts

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+import { expect, test } from '../fixtures/auth';
+
+test('用户管理视觉基线', async ({ page }) => {
+  await page.setViewportSize({ width: 1440, height: 900 });
+  await page.goto('/system/user');
+  await page.getByRole('table').waitFor();
+  await page.evaluate(() => document.fonts.ready);
+
+  await expect(page).toHaveScreenshot('system-users-list.png', {
+    fullPage: true,
+  });
+});