fix: restore volcProjects for create dialog (was removed during cleanup)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/iam/IAMUserList.vue

@@ -423,7 +423,21 @@ async function handleEditProfile() {
 
 // (Policies dialog removed - now in UserPoliciesView)
 
-// (Projects dialog removed - now in UserPoliciesView)
+// Volcengine projects (for create dialog)
+const volcProjects = ref([])
+const volcProjectsLoading = ref(false)
+
+async function loadVolcProjects() {
+  volcProjectsLoading.value = true
+  try {
+    const { data } = await api.get('/api/v1/projects/')
+    volcProjects.value = data
+  } catch (e) {
+    ElMessage.error('获取火山项目列表失败')
+  } finally {
+    volcProjectsLoading.value = false
+  }
+}
 
 // --- Allocate ---
 const maxDeduct = computed(() => {