chore: 初始化 Slurm Go SDK 项目骨架和核心客户端

添加 Go 模块定义、.gitignore、包文档、HTTP Client 核心、Token 认证和错误处理。

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

internal/slurm/errors.go

@@ -0,0 +1,38 @@
+package slurm
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// ErrorResponse represents an error returned by the Slurm REST API.
+type ErrorResponse struct {
+	Response *http.Response
+	Message  string
+}
+
+func (r *ErrorResponse) Error() string {
+	return fmt.Sprintf("%v %v: %d %s",
+		r.Response.Request.Method, r.Response.Request.URL,
+		r.Response.StatusCode, r.Message)
+}
+
+// CheckResponse checks the API response for errors. It returns nil if the
+// response is a 2xx status code. For non-2xx codes, it reads the response
+// body and returns an ErrorResponse.
+func CheckResponse(r *http.Response) error {
+	if c := r.StatusCode; c >= 200 && c <= 299 {
+		return nil
+	}
+
+	errorResponse := &ErrorResponse{Response: r}
+	data, err := io.ReadAll(r.Body)
+	if err != nil || len(data) == 0 {
+		errorResponse.Message = r.Status
+		return errorResponse
+	}
+
+	errorResponse.Message = string(data)
+	return errorResponse
+}