ci(codeql): add workflow_dispatch trigger for manual runs

Allows triggering CodeQL analysis from the GitHub Actions UI without
waiting for a push or the weekly schedule.

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

Author: ihor-sokoliuk

.github/workflows/codeql.yml

@@ -7,6 +7,7 @@ on:
     branches: [main]
   schedule:
     - cron: '0 6 * * 1'  # weekly, Monday 06:00 UTC
+  workflow_dispatch:
 
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