fix: scale replicas in response, K8s metrics client, quota precheck, auth tests

- Add GetMetrics method to MetricsClient interface and implement cluster metrics API
- Add QuotaPrecheck service for validating resource quotas before deployment
- Add auth DTO with role/permission models and auth handler tests
- Add instance diagnostics: mounted NFS volumes, labels, annotations in pod diagnostics
- Update workspace handler with GetWorkspace endpoint and shared-user list
- Fix monitoring handler to use correct service method name
- Add tail_lines fallback in instance handler for snake_case query params
- Update nginx config for SSE log streaming support (no buffering)
- Add comprehensive test coverage: auth_service_test, auth_handler_test,
  auth_dto_test, metrics_client_test, quota_precheck_test
- Update error messages for quota validation and instance operations
- ModifyModal: fix YAML lineWidth:0, modified keys summary, delta-only submit
- InstanceCard: correctly disable scale-minus when replicas <= 0
- SidebarLayout: add hover transition for sidebar items
- Update todo.md and lessons.md with latest fixes

frontend/src/api/index.ts

@@ -3,7 +3,7 @@
  * Export configured API client, generated functions, and friendly aliases.
  */
 
-type AxiosOptions<T extends (...args: any) => any> = Parameters<T>[2];
+type AxiosOptions<T extends (...args: never[]) => unknown> = Parameters<T>[2];
 
 import {
   deleteClustersClusterId,
@@ -143,7 +143,10 @@ export type CreateRegistryRequest = GeneratedCreateRegistryRequest;
 export type UpdateRegistryRequest = GeneratedUpdateRegistryRequest;
 export type RegistryHealthResponse = GeneratedRegistryHealthResponse;
 
-export type InstanceResponse = GeneratedInstanceResponse;
+export type InstanceResponse = GeneratedInstanceResponse & {
+  ownerId?: string;
+  ownerUsername?: string;
+};
 export type CreateInstanceRequest = GeneratedCreateInstanceRequest;
 export type UpdateInstanceRequest = GeneratedUpdateInstanceRequest;
 export type InstanceEntry = GeneratedInstanceEntry;
@@ -242,7 +245,7 @@ export const scaleInstance = (
   instanceId: string,
   body: { replicas: number; workload?: string },
 ) => {
-  return customAxiosInstance<{ instance: any; replicas: number; message: string }>({
+  return customAxiosInstance<{ instance: InstanceResponse; replicas: number; message: string }>({
     url: `/clusters/${encodeURIComponent(clusterId)}/instances/${encodeURIComponent(instanceId)}/scale`,
     method: "POST",
     data: body,
@@ -252,7 +255,7 @@ export const getInstanceValuesDiff = (
   clusterId: string,
   instanceId: string,
 ) => {
-  return customAxiosInstance<{ current: Record<string, any>; defaults: Record<string, any> }>({
+  return customAxiosInstance<{ current: Record<string, unknown>; defaults: Record<string, unknown> }>({
     url: `/clusters/${encodeURIComponent(clusterId)}/instances/${encodeURIComponent(instanceId)}/values-diff`,
     method: "GET",
   });