feat: add k8s cluster resource management module

- Add K8s module with kubeconfig storage in cluster_config table
- Implement resource list APIs for 8 kinds: namespace, deployment, statefulset, service, configmap, pod, pv, pvc
- Add K8sResourceList page with sidebar navigation and resource tables
- Support YAML upload/input dialog for resource creation via dynamic client
- Add kubeconfig settings drawer
- Increase main content width from lg to xl for better table display
- Add navigation link for cluster resources in top bar

🤖 Generated with [Qoder][https://qoder.com]

internal/module/k8s/handler.config.go

@@ -0,0 +1,54 @@
+package k8s
+
+import (
+	"context"
+	"encoding/json"
+
+	"gitea.loveuer.com/loveuer/cluster/internal/model"
+	"gitea.loveuer.com/loveuer/cluster/pkg/resp"
+	"gitea.loveuer.com/loveuer/cluster/pkg/store"
+	"github.com/gofiber/fiber/v3"
+	"gorm.io/gorm"
+)
+
+func ClusterConfigGet(ctx context.Context, db *gorm.DB, store store.Store) fiber.Handler {
+	return func(c fiber.Ctx) error {
+		var config model.ClusterConfig
+		
+		if err := db.Where("key = ?", "kubeconfig").First(&config).Error; err != nil {
+			if err == gorm.ErrRecordNotFound {
+				return resp.R200(c, map[string]any{
+					"kubeconfig": "",
+				})
+			}
+			return resp.R500(c, "", nil, err)
+		}
+
+		return resp.R200(c, map[string]any{
+			"kubeconfig": config.Value,
+		})
+	}
+}
+
+func ClusterConfigSet(ctx context.Context, db *gorm.DB, store store.Store) fiber.Handler {
+	return func(c fiber.Ctx) error {
+		var req struct {
+			Kubeconfig string `json:"kubeconfig"`
+		}
+
+		if err := json.Unmarshal(c.Body(), &req); err != nil {
+			return resp.R400(c, "", nil, err)
+		}
+
+		config := model.ClusterConfig{
+			Key:   "kubeconfig",
+			Value: req.Kubeconfig,
+		}
+
+		if err := db.Where("key = ?", "kubeconfig").Assign(config).FirstOrCreate(&config).Error; err != nil {
+			return resp.R500(c, "", nil, err)
+		}
+
+		return resp.R200(c, nil)
+	}
+}