fix(admin-v2): Restore HEAD SDK files for compatibility with new pages

Restore the SDK context, types, and component files to the HEAD version
since newer pages (company-profile, import) depend on these API changes.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-v2/app/api/sdk/v1/checkpoints/route.ts

@@ -9,10 +9,18 @@ import { NextRequest, NextResponse } from 'next/server'
 
 // Checkpoint definitions
 const CHECKPOINTS = {
+  'CP-PROF': {
+    id: 'CP-PROF',
+    step: 'company-profile',
+    name: 'Unternehmensprofil Checkpoint',
+    type: 'REQUIRED',
+    blocksProgress: true,
+    requiresReview: 'NONE',
+  },
   'CP-UC': {
     id: 'CP-UC',
-    step: 'use-case-workshop',
-    name: 'Use Case Checkpoint',
+    step: 'use-case-assessment',
+    name: 'Anwendungsfall Checkpoint',
     type: 'REQUIRED',
     blocksProgress: true,
     requiresReview: 'NONE',