feat: add config API and update ApkList to use configured tabs

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

app/api/config/route.ts

@@ -0,0 +1,8 @@
+import { NextResponse } from 'next/server';
+import { APK_TABS } from '@/lib/constants';
+
+export async function GET() {
+  return NextResponse.json({
+    tabs: APK_TABS,
+  });
+}

app/download/ApkList.tsx

@@ -1,6 +1,6 @@
 'use client';
 
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import useSWR from 'swr';
 import { type ApkEnvironment } from '@/lib/apk-parser';
 import ApkTable from './ApkTable';
@@ -22,16 +22,26 @@ interface ApkListProps {
   commitId: string;
 }
 
-const TABS: ApkEnvironment[] = ['dev', 'product', 'sandbox', 'other'];
-
 export default function ApkList({ project, version, commitId }: ApkListProps) {
+  const [configuredTabs, setConfiguredTabs] = useState<string[]>([]);
   const [activeTab, setActiveTab] = useState<ApkEnvironment>('product');
 
+  // Fetch config on mount
+  useEffect(() => {
+    fetch('/api/config')
+      .then(res => res.json())
+      .then(data => setConfiguredTabs(data.tabs))
+      .catch(() => setConfiguredTabs(['dev', 'sandbox'])); // fallback
+  }, []);
+
   const { data: apks, isLoading, error } = useSWR<Apk[]>(
     `/api/apks?project=${project}&version=${version}&commit=${commitId}`,
     fetcher
   );
 
+  // Build tabs: product -> configured -> other
+  const TABS: ApkEnvironment[] = ['product', ...configuredTabs.filter(t => t !== 'product' && t !== 'other') as ApkEnvironment[], 'other'];
+
   if (isLoading) {
     return (
       <div className="text-center py-8 text-gray-500">

app/download/__tests__/ApkList.test.tsx

@@ -1,10 +1,14 @@
 import React from 'react';
-import { render, screen, fireEvent } from '@testing-library/react';
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
 import ApkList from '../ApkList';
 import useSWR from 'swr';
 
 jest.mock('swr');
 
+// Mock fetch for config API
+const mockFetch = jest.fn();
+global.fetch = mockFetch;
+
 describe('ApkList', () => {
   const mockApks = [
     {
@@ -39,20 +43,34 @@ describe('ApkList', () => {
       isLoading: false,
       error: null,
     });
+    // Mock config API response
+    mockFetch.mockResolvedValue({
+      json: () => Promise.resolve({ tabs: ['dev', 'sandbox'] }),
+    });
   });
 
-  it('should render all 4 tabs', () => {
+  afterEach(() => {
+    mockFetch.mockClear();
+  });
+
+  it('should render all 4 tabs', async () => {
     render(<ApkList project="FT" version="0_42" commitId="" />);
 
+    await waitFor(() => {
       expect(screen.getByText(/dev/)).toBeInTheDocument();
       expect(screen.getByText(/product/)).toBeInTheDocument();
       expect(screen.getByText(/sandbox/)).toBeInTheDocument();
       expect(screen.getByText(/other/)).toBeInTheDocument();
     });
+  });
 
-  it('should switch tabs correctly', () => {
+  it('should switch tabs correctly', async () => {
     render(<ApkList project="FT" version="0_42" commitId="" />);
 
+    await waitFor(() => {
+      expect(screen.getByText(/dev/)).toBeInTheDocument();
+    });
+
     const devTab = screen.getByText(/dev/);
     fireEvent.click(devTab);