fix: include photo-wall/package-lock.json for CI (npm ci requires it)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: chenhaiyun

.gitignore

@@ -43,5 +43,3 @@ build/
 # Logs
 *.log
 
-# Lock files in subdirectories (root lock file is kept)
-photo-wall/package-lock.json