feat(slurmdb): add ConfigService

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

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

internal/slurm/slurmdb_config_test.go

@@ -0,0 +1,68 @@
+package slurm
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestSlurmdbConfigService_GetConfig(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/config", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `{"accounts": [], "clusters": [], "qos": []}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	resp, _, err := client.SlurmdbConfig.GetConfig(context.Background())
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+}
+
+func TestSlurmdbConfigService_PostConfig(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/config", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "POST")
+		fmt.Fprint(w, `{}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	config := &OpenapiSlurmdbdConfigResp{}
+	resp, _, err := client.SlurmdbConfig.PostConfig(context.Background(), config)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+}
+
+func TestSlurmdbConfigService_GetConfig_Error(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/config", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprint(w, `{"errors": [{"error": "internal error"}]}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	_, _, err := client.SlurmdbConfig.GetConfig(context.Background())
+	if err == nil {
+		t.Fatal("expected error for 500 response")
+	}
+	if !strings.Contains(err.Error(), "500") {
+		t.Errorf("expected error to contain 500, got %v", err)
+	}
+}