feat(frontend): 优化页面功能和 UI

- 添加模型配置页面 (ModelSettingsView.vue)
- 优化首页项目列表显示和删除功能 (HomeView.vue)
- 优化项目详情页 (ProjectView.vue)
- 优化项目设置页 (Settings.vue)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/views/ProjectView.vue

@@ -76,7 +76,8 @@ const isActive = (path) => route.path.includes(path)
 const fetchProject = async () => {
   try {
     const res = await projectApi.get(id.value)
-    project.value = res.data
+    // New format: returns project directly
+    project.value = res
   } catch (error) {
     ElMessage.error('加载项目失败')
   }