Fix module import issue on fresh installs

- Added create_directories function to properly set up directory structure
- Added copy_module_files function to ensure JS modules are copied correctly
- Updated server.js to handle module imports more resiliently
- Fixed imports to work with both .js and no extension module references

🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>

main-installer.sh

@@ -296,6 +296,13 @@ EOF
     exit 1
   }
   
+  # Copy JavaScript module files during update as well
+  log "INFO" "Copying JavaScript module files..."
+  copy_module_files || {
+    log "ERROR" "Failed to copy JavaScript module files"
+    exit 1
+  }
+  
 else
   # This is a fresh installation - run all steps
   
@@ -359,6 +366,7 @@ else
   log "INFO" "Creating directories..."
   # Make sure CONFIG_DIR is set and exported
   export CONFIG_DIR=${CONFIG_DIR:-"/etc/transmission-rss-manager"}
+  # Call our new create_directories function
   create_directories || {
     log "ERROR" "Directory creation failed"
     exit 1