chore: remove coverage.txt from git tracking

- Remove coverage.txt from git tracking as it's a generated file
- Add coverage.txt to .gitignore to prevent future commits
- Coverage files should not be committed to version control

Author: d0ugal

.gitignore

@@ -10,6 +10,7 @@
 
 # Output of the go coverage tool, specifically when used with LiteIDE
 *.out
+coverage.txt
 
 # Dependency directories (remove the comment below to include it)
 # vendor/