chore(.gitignore): adds composer.lock and updates .gitignore

Adds the `composer.lock` file to track dependencies and ensures consistent installations across environments.

Updates `.gitignore` to remove redundant entries for `composer.lock` as it is now managed and tracked.

Author: firestar300

.gitignore

@@ -81,7 +81,6 @@ package-lock.json
 
 ### config
 /vendor/
-composer.lock
 
 ### conf-img
-assets/conf-img/*.json
+assets/conf-img/*.json