test(e2e,unit): add navigation edge cases and component coverage

- Add missing-paths E2E spec for desktop/mobile navigation and contrast
- Add local Playwright config for dev server testing
- Expand unit tests for CMS data server, products, contact and UI components
- Adjust jest config for new test patterns

src/components/sections/sections.test.tsx

@@ -248,11 +248,10 @@ describe('ProductCard', () => {
 });
 
 describe('ServiceCard', () => {
-  it('should render number, title, description and link', async () => {
+  it('should render title, description and link', async () => {
     const { ServiceCard } = await import('./service-card');
     render(
       <ServiceCard
-        number="01"
         title="战略咨询"
         description="业务诊断与战略规划"
         href="/services/consulting"
@@ -268,7 +267,6 @@ describe('ServiceCard', () => {
     const { ServiceCard } = await import('./service-card');
     render(
       <ServiceCard
-        number="02"
         title="Data"
         description="Analysis"
         href="/services/data"
@@ -280,7 +278,7 @@ describe('ServiceCard', () => {
     expect(target).toBeTruthy();
   });
 
-  it('should apply custom color', async () => {
+  it('should accept optional number and color props for compatibility', async () => {
     const { ServiceCard } = await import('./service-card');
     render(
       <ServiceCard