refactor: enhance code clarity and maintainability across multiple files

- Updated comments to improve clarity and adhere to best practices in ascii.go, main.go, and diagnostics.
- Removed unnecessary linter directives for improved readability in imaging.go and ptz.go.
- Reformatted function signatures and added helper calls in tests for consistency and clarity.
- Enhanced error handling and logging consistency in various server files, ensuring better maintainability.

server/server.go

@@ -160,7 +160,7 @@ func (s *Server) Start(ctx context.Context) error {
 	select {
 	case <-ctx.Done():
 		fmt.Println("\n🛑 Shutting down server...")
-		const shutdownTimeout = 5 //nolint:mnd // Server shutdown timeout in seconds
+		const shutdownTimeout = 5 // Server shutdown timeout in seconds
 		shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownTimeout*time.Second)
 		defer cancel()