feat: 添加 Partition 领域类型和 PartitionsService

包含 PartitionInfo 及其子结构体（Nodes、Accounts、Groups、QOS、TRES、CPUs、Defaults、Maximums、Minimums、Priority、Timeouts）。PartitionsService 提供 GetPartitions 和 GetPartition 2 个方法。

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

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

internal/slurm/slurm_partitions.go

@@ -0,0 +1,71 @@
+package slurm
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"strconv"
+)
+
+// GetPartitionsOptions specifies optional parameters for GetPartitions.
+type GetPartitionsOptions struct {
+	UpdateTime *int64 `url:"update_time,omitempty"`
+}
+
+// GetPartitions lists all partitions.
+func (s *PartitionsService) GetPartitions(ctx context.Context, opts *GetPartitionsOptions) (*OpenapiPartitionResp, *Response, error) {
+	path := "slurm/v0.0.40/partitions"
+	req, err := s.client.NewRequest("GET", path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if opts != nil {
+		u, parseErr := url.Parse(req.URL.String())
+		if parseErr != nil {
+			return nil, nil, parseErr
+		}
+		q := u.Query()
+		if opts.UpdateTime != nil {
+			q.Set("update_time", strconv.FormatInt(*opts.UpdateTime, 10))
+		}
+		u.RawQuery = q.Encode()
+		req.URL = u
+	}
+
+	var result OpenapiPartitionResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}
+
+// GetPartition gets a single partition by name.
+func (s *PartitionsService) GetPartition(ctx context.Context, partitionName string, opts *GetPartitionsOptions) (*OpenapiPartitionResp, *Response, error) {
+	path := fmt.Sprintf("slurm/v0.0.40/partition/%s", partitionName)
+	req, err := s.client.NewRequest("GET", path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if opts != nil {
+		u, parseErr := url.Parse(req.URL.String())
+		if parseErr != nil {
+			return nil, nil, parseErr
+		}
+		q := u.Query()
+		if opts.UpdateTime != nil {
+			q.Set("update_time", strconv.FormatInt(*opts.UpdateTime, 10))
+		}
+		u.RawQuery = q.Encode()
+		req.URL = u
+	}
+
+	var result OpenapiPartitionResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}