feat(methodology): add CMS-driven methodology page skeleton

- 新增 methodology 内容模型（content-types + seed），内容由 CMS 后台可编辑
- 新建 /methodology 页面：Hero / 四阶段 Cards / 空态占位 / 轻量 CTA
- 首页「了解我们的方法论」CTA 改指向 /methodology；sitemap 收录
- 单元测试 4/4 + 视觉基线通过，type-check / lint 0 errors

src/app/(marketing)/methodology/methodology-content.test.tsx

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+import { describe, it, expect, jest } from '@jest/globals';
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom';
+
+// ─── Mocks ───────────────────────────────────────────────────────────────
+
+jest.mock('framer-motion', () => ({
+  motion: {
+    div: ({ children, className, style, ...props }: any) => (
+      <div data-testid="motion-div" className={className} style={style} {...props}>{children}</div>
+    ),
+    h1: ({ children, className, ...props }: any) => (
+      <h1 data-testid="motion-h1" className={className} {...props}>{children}</h1>
+    ),
+    p: ({ children, className, ...props }: any) => (
+      <p data-testid="motion-p" className={className} {...props}>{children}</p>
+    ),
+  },
+  useInView: jest.fn(() => true),
+  AnimatePresence: ({ children }: any) => <>{children}</>,
+}));
+
+jest.mock('@/components/ui/scroll-reveal', () => ({
+  ScrollReveal: ({ children, className }: any) => (
+    <div data-testid="scroll-reveal" className={className}>{children}</div>
+  ),
+  StaggerReveal: ({ children, className }: any) => (
+    <div data-testid="stagger-reveal" className={className}>{children}</div>
+  ),
+}));
+
+jest.mock('@/components/ui/button', () => ({
+  Button: ({ children, className, ...props }: any) => (
+    <button className={className} data-testid="mock-button" {...props}>
+      {children}
+    </button>
+  ),
+}));
+
+jest.mock('@/components/ui/page-decoration', () => ({
+  EASE_OUT: [0.22, 1, 0.36, 1],
+}));
+
+jest.mock('lucide-react', () => {
+  const mockIcon = (name: string) => {
+    const Icon = (props: any) => <svg data-testid={`icon-${name.toLowerCase()}`} className={props.className} />;
+    Icon.displayName = name;
+    return Icon;
+  };
+  return {
+    ArrowRight: mockIcon('arrow-right'),
+    CheckCircle2: mockIcon('check-circle2'),
+  };
+});
+
+// ─── Mock Data ────────────────────────────────────────────────────────────
+
+const mockData = {
+  heroSubtitle: '方法论',
+  heroTitle: '四阶段推进数字化转型',
+  heroDescription: '从诊断到优化，步步可衡量。',
+  phases: [
+    {
+      number: 1,
+      title: '诊断评估',
+      subtitle: '了解现状，找准痛点',
+      description: '深入调研企业现状，识别关键痛点。',
+      activities: ['业务流程调研', 'IT基础设施评估'],
+      deliverables: ['成熟度评估报告', '关键痛点清单'],
+    },
+    {
+      number: 2,
+      title: '战略规划',
+      subtitle: '明确方向，制定路线',
+      description: '制定匹配企业战略的转型路线图。',
+      activities: ['IT战略对齐'],
+      deliverables: ['战略规划书'],
+    },
+  ],
+};
+
+// ─── Tests ────────────────────────────────────────────────────────────────
+
+describe('MethodologyContent - 方法论页面', () => {
+  it('should render hero section', async () => {
+    const { MethodologyContent } = await import('./methodology-content');
+    render(<MethodologyContent data={mockData} />);
+
+    expect(screen.getByText('方法论')).toBeInTheDocument();
+    expect(screen.getByText('四阶段推进数字化转型')).toBeInTheDocument();
+    expect(screen.getByText('从诊断到优化，步步可衡量。')).toBeInTheDocument();
+  });
+
+  it('should render all methodology phases with activities and deliverables', async () => {
+    const { MethodologyContent } = await import('./methodology-content');
+    render(<MethodologyContent data={mockData} />);
+
+    expect(screen.getByText('诊断评估')).toBeInTheDocument();
+    expect(screen.getByText('战略规划')).toBeInTheDocument();
+    expect(screen.getAllByText('核心活动').length).toBeGreaterThanOrEqual(1);
+    expect(screen.getAllByText('交付物').length).toBeGreaterThanOrEqual(1);
+    expect(screen.getByText('业务流程调研')).toBeInTheDocument();
+    expect(screen.getByText('成熟度评估报告')).toBeInTheDocument();
+  });
+
+  it('should render empty state when phases are missing', async () => {
+    const { MethodologyContent } = await import('./methodology-content');
+    render(<MethodologyContent data={{ heroTitle: '方法论' }} />);
+
+    expect(screen.getByText('方法论内容即将发布')).toBeInTheDocument();
+  });
+
+  it('should render CTA links to services and contact', async () => {
+    const { MethodologyContent } = await import('./methodology-content');
+    render(<MethodologyContent data={mockData} />);
+
+    const links = screen.getAllByRole('link');
+    expect(links.some((l) => l.getAttribute('href') === '/services')).toBe(true);
+    expect(links.some((l) => l.getAttribute('href') === '/contact')).toBe(true);
+  });
+});