feat: 添加 Shares 公平共享类型和 SharesService

包含 SharesRespMsg、AssocSharesObjWrap、TRES 明细等类型。SharesService 提供 GetShares 方法，支持按 accounts 和 users 查询。

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

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

internal/slurm/slurm_shares.go

@@ -0,0 +1,44 @@
+package slurm
+
+import (
+	"context"
+	"net/url"
+)
+
+// GetSharesOptions specifies optional parameters for GetShares.
+type GetSharesOptions struct {
+	Accounts *string `url:"accounts,omitempty"`
+	Users    *string `url:"users,omitempty"`
+}
+
+// GetShares retrieves fairshare shares information.
+func (s *SharesService) GetShares(ctx context.Context, opts *GetSharesOptions) (*OpenapiSharesResp, *Response, error) {
+	path := "slurm/v0.0.40/shares"
+	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.Accounts != nil {
+			q.Set("accounts", *opts.Accounts)
+		}
+		if opts.Users != nil {
+			q.Set("users", *opts.Users)
+		}
+		u.RawQuery = q.Encode()
+		req.URL = u
+	}
+
+	var result OpenapiSharesResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}