style: fix whitespace and wsl_v5 linting issues

- Remove unnecessary trailing/leading whitespace
- Add missing whitespace above return statements, if statements, and loops
- Fix whitespace around variable declarations and assignments
- Improve code readability by following Go whitespace conventions
- Maintain functionality while improving code style consistency

Addresses majority of wsl_v5 and whitespace linting rules.

pkg/client/example_test.go

@@ -288,7 +288,6 @@ func ExampleClient_GetCapabilities() {
 func ExampleClient_GetSupportedURLs_concept() {
 	// Example of how to use GetSupportedURLs() method
 	// Note: This example shows the concept but doesn't execute to avoid requiring a real device
-
 	config := &client.Config{Host: "192.168.1.100"}
 	c := client.NewClient(config)