Clean up code style and update dependencies

[philoserf]

• Format code according to modern Go style guidelines
• Update Go version to 1.24 in go.mod
• Update all dependencies to latest versions
• Standardize error handling (using assert.Error/NoError instead of assert.NotNil/Nil)
• Fix JSON equality testing with assert.JSONEq instead of string comparison
• Replace fmt.Errorf with errors.New for simple error creation
• Clean up documentation layout with modern Markdown formatting
• Remove trailing whitespace and normalize line endings
• Add consistent spacing and line breaks throughout codebase
• Reorganize imports (standard library first, then third-party)