feat(content): deepen Bain differentiation across product, solution and service pages

- Replace decorative numbering and side-stripe borders with structured copy
- Add scenario positioning, capability metrics and verifiable dimensions
- Refine service timelines, deliverables and case-study narratives
- Update content constants to support CMS seeding

src/app/(marketing)/cases/[slug]/client.tsx

@@ -41,6 +41,11 @@ export function CaseDetailClient({ item }: CaseDetailClientProps) {
           role: `${data.testimonial.role}，${data.testimonial.company}`,
         }
       : undefined,
+    projectDuration: data.projectDuration,
+    departments: data.departments,
+    dataScale: data.dataScale,
+    businessProblem: data.businessProblem,
+    verified: data.verified,
   };
 
   return (