refactor: full-stack restructure with multi-tenancy, workspace management, and K8s diagnostics

- Add Workspace domain (entity, repository, service, handler, DTO)
- Add multi-tenant K8s client with tenant binding and quota management
- Add K8s diagnostics client (instance diagnostics)
- Add authorization middleware (authz package)
- Restructure frontend to feature-based architecture (features/)
- Add User Management page in configuration
- Add AccessDenied page and route guards
- Refactor shared components (form inputs, layout, UI)
- Update Tailwind config for new design system
- Add comprehensive documentation (docs/, tasks/, plans)
- Improve cluster service with better kubeconfig handling
- Add tests for crypto, config, helm client, tenant binding

backend/scripts/test-all-modes.sh

@@ -87,9 +87,11 @@ test_api() {
     log_info "测试 API..."
     
     # 测试注册
+    local test_username="testuser$RANDOM"
+    local test_password="test123"
     register_response=$(curl -s -X POST http://localhost:8080/api/v1/auth/register \
         -H "Content-Type: application/json" \
-        -d '{"username":"testuser'"$RANDOM"'","password":"test123","email":"test@example.com"}')
+        -d '{"username":"'"$test_username"'","password":"'"$test_password"'","email":"test@example.com"}')
     
     if echo "$register_response" | grep -q "id"; then
         log_success "$mode 模式 API 注册测试通过"
@@ -100,7 +102,7 @@ test_api() {
     # 测试登录
     login_response=$(curl -s -X POST http://localhost:8080/api/v1/auth/login \
         -H "Content-Type: application/json" \
-        -d '{"username":"admin","password":"admin123"}')
+        -d '{"username":"'"$test_username"'","password":"'"$test_password"'"}')
     
     if echo "$login_response" | grep -q "accessToken"; then
         log_success "$mode 模式 API 登录测试通过"
@@ -392,4 +394,3 @@ main() {
 
 # 执行主函数
 main
-