fix(frontend): remove duplicate :repository prop in KBSearchResultPanel

[mrveiss]

Fixes provisioning frontend build failure caused by duplicate prop declaration.

Summary

• Removed duplicate :repository="knowledgeRepo" prop from KBSearchResultPanel
• Parent (KnowledgeSearch.vue) already passes this prop on line 202
• Duplicate on line 206 caused Vue compiler syntax error: 'Duplicate attribute'

Root Cause

KBSearchResultPanel component received the same prop twice:

<KBSearchResultPanel
  :repository="knowledgeRepo"
  ...
  :repository="knowledgeRepo"  <!-- duplicate, removed -->
/>

Test Plan

• Build completes without duplicate attribute error
• Re-run provisioning to verify frontend builds successfully
• Verify KB search functionality works

Related Issues

• Related to fix(frontend): KBSearchResultPanel uses as-any cast + duplicates KnowledgeRepository instance #3940 (KBSearchResultPanel repository cleanup)
• Filed bug(frontend): KBSearchResultPanel still creates duplicate KnowledgeRepository instance #3969 (child component still creates own instance)