ngamux

## When to use this skill
Use this skill when the user needs to:
- **Define HTTP endpoints**: Create new routes for various HTTP methods (e.g., `mux.Get("/users/:id", getUserHandler)`) including dynamic path segments (`/users/{id}`) and wildcards (`/files/*filePath`).
- **Implement request preprocessing/postprocessing**: Add global middlewares (e.g., for authentication, logging, CORS) or group-specific middlewares to handle requests before they reach the main handler or after they are processed. For example, `mux.Use(authMiddleware)` or `apiGroup.Use(loggingMiddleware)`.
- **Extract incoming data from requests**:
    - **URL Parameters**: Retrieve values from dynamic path segments (e.g., `req.Params("id")`).
    - **Query Parameters**: Access query string values (e.g., `req.Query("name", "Guest")`).
    - **Form Data**: Parse `application/x-www-form-urlencoded` or `multipart/form-data` (e.g., `req.FormValue("username")`, `req.FormFile("image")`).
    - **JSON Payloads**: Decode `application/json` request bodies into Go structs (e.g., `req.JSON(&user)`).
- **Construct and send various response types**:
    - **JSON Responses**: Send structured data as JSON (e.g., `ngamux.Res(rw).Status(http.StatusOK).Json(data)`).
    - **Text Responses**: Send plain text (e.g., `ngamux.Res(rw).Status(http.StatusOK).Text("Hello, World!")`).
    - **HTML Responses**: Render HTML templates (e.g., `ngamux.Res(rw).Status(http.StatusOK).HTML("template.html", data)`).
    - **Custom Status Codes**: Set specific HTTP status codes for responses.
- **Configure router behavior**: Adjust global settings like automatically removing trailing slashes (`ngamux.WithTrailingSlash()`), setting the logging verbosity (`ngamux.WithLogLevel(slog.LevelDebug)`), or providing custom `json.Marshal`/`json.Unmarshal` functions for specific serialization needs.
- **Organize routes with grouping**: Create nested route groups to apply common path prefixes and middlewares to a set of routes (e.g., `/api/v1`).
- **D...