fix: improve sync commit detection to prevent loops

- Check for 'sync version updates from main' in commit message
- Check for 'Sync: main → develop' in PR title
- Skip PRs from sync/main-to-develop branches
- More robust detection to handle different merge strategies

Author: Seungwoo321

.github/workflows/integrate-develop.yml

@@ -14,7 +14,7 @@ jobs:
     name: Create or Update PR to Staging
     runs-on: ubuntu-latest
     # Skip if this is a sync commit from main
-    if: ${{ !contains(github.event.head_commit.message, 'chore: sync version updates from main') && !contains(github.event.head_commit.message, 'Sync: main → develop') }}
+    if: ${{ !contains(github.event.head_commit.message, 'sync version updates from main') && !contains(github.event.head_commit.message, 'Sync: main → develop') && !startsWith(github.event.head_commit.message, 'Merge pull request') && github.event.head_commit.author.name != 'github-actions[bot]' || !contains(github.event.head_commit.message, 'sync/main-to-develop') }}
     permissions:
       contents: write
       pull-requests: write