fix: Add git safe.directory configuration for update commands

- Add 'git config --global --add safe.directory' before git pull in update_instance
- Add same fix to small management script update command
- Resolves 'dubious ownership' error when updating repositories
  that were cloned as root but accessed by different users

This fixes the git ownership security warning that prevents
git pull from working during updates.

manage-patchmon.sh

@@ -1144,6 +1144,7 @@ case \$1 in
         ;;
     "update")
         cd $APP_DIR
+        git config --global --add safe.directory $APP_DIR 2>/dev/null || true
         git pull
         npm install
         cd backend && npm install
@@ -1364,6 +1365,10 @@ update_instance() {
     
     # Update code
     print_info "Pulling latest code..."
+    
+    # Fix git ownership issue if it exists
+    git config --global --add safe.directory "$app_dir" 2>/dev/null || true
+    
     git pull
     
     # Update dependencies