Fix .gitignore to exclude user-specific files

- Remove tracked .idea/vcs.xml (user-specific VCS settings)
- Use whitelist approach for .idea/ directory (consistent with backend)
- Improve log file patterns (*.log)
- Remove redundant .idea/workspace.xml pattern (covered by wildcard)

.gitignore

@@ -5,10 +5,10 @@ target/
 .kotlin
 
 ### IntelliJ IDEA ###
-.idea/modules.xml
-.idea/jarRepositories.xml
-.idea/compiler.xml
-.idea/libraries/
+.idea/*
+!.idea/runConfigurations/
+!.idea/encodings.xml
+!.idea/misc.xml
 *.iws
 *.iml
 *.ipr
@@ -40,7 +40,7 @@ build/
 
 ## Database related
 connectionpetstore.properties
-.idea/workspace.xml
 
 # Log files
+*.log
 log.txt