[HttpGet("{id:guid}")]
public async Task<IActionResult> GetById(Guid id)
{
    try
    {
        var result = await _service.GetByIdAsync(id);
        if (result == null)
            return NotFound(new { error = "NOT_FOUND", message = $"Resource {id} not found" });
        return Ok(result);
    }
    catch (Exception ex)
    {
        _logger.LogError(ex, "Failed to get resource {Id}", id);
        return StatusCode(500, new { error = "API_ERROR", message = "Internal server error" });
    }
}

js/
├── api/           # API client and service modules
│   ├── config/    # Environment configuration
│   ├── core/      # Base HTTP client
│   └── services/  # Endpoint-specific services
├── pages/         # Page-specific scripts
└── utils.js       # Shared utilities