feat: 添加 API 客户端以处理 basePath 并更新所有 fetch 调用

移除 next.config.js 中的 standalone 输出配置，添加 lib/api-client.ts 封装 fetch 请求，
自动为所有 API 调用添加配置的 basePath。更新所有页面和组件中的 fetch 调用以使用新的 fetchApi 函数，
确保在部署到子路径时 API 请求能正确工作。同时调整 tsconfig.json 的格式并修复项目创建时的字段名。

app/my-tasks/page.tsx

@@ -12,6 +12,7 @@ import type { Task, TaskStep, User } from '@/types/database';
 import { CheckSquare, Clock, Calendar, AlertTriangle, User as UserIcon, Plus } from 'lucide-react';
 import { TaskEditDialog } from '@/components/task-edit-dialog';
 import { toast } from 'sonner';
+import { fetchApi } from '@/lib/api-client';
 
 interface TaskWithRelations extends Task {
   steps: TaskStep[];
@@ -41,7 +42,7 @@ export default function MyTasksPage() {
         ? '/api/tasks'
         : `/api/tasks?user_id=${currentUser?.id}&include_help=true`;
 
-      const res = await fetch(url);
+      const res = await fetchApi(url);
       if (res.ok) {
         const data = await res.json();
         // Enrich with owner info locally since API doesn't join
@@ -61,7 +62,7 @@ export default function MyTasksPage() {
   const fetchHelpSteps = async () => {
     if (!currentUser?.id || currentUser.role === 'owner') return;
     try {
-      const res = await fetch(`/api/task-steps?help_requested_to_user_id=${currentUser.id}`);
+      const res = await fetchApi(`/api/task-steps?help_requested_to_user_id=${currentUser.id}`);
       if (res.ok) {
         const data = await res.json();
         setHelpSteps(data);
@@ -80,7 +81,7 @@ export default function MyTasksPage() {
 
   const handleTaskStatusChange = async (taskId: string, newStatus: string) => {
     try {
-      const res = await fetch(`/api/tasks/${taskId}`, {
+      const res = await fetchApi(`/api/tasks/${taskId}`, {
         method: 'PATCH',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({ status: newStatus }),