Fix health check timing and improve admin login

- Increase health check wait times in Gitea Actions workflow
- Add additional main page accessibility check with longer timeout
- Remove basic auth middleware to use custom admin login only
- Custom admin login at /manage route provides better UX than browser basic auth

This should resolve the 'Main page is not accessible' issue and provide a nicer admin login experience.

middleware.ts

@@ -2,41 +2,6 @@ import { NextResponse } from 'next/server';
 import type { NextRequest } from 'next/server';
 
 export function middleware(request: NextRequest) {
-  // Protect admin routes with Basic Auth (legacy routes)
-  if (request.nextUrl.pathname.startsWith('/admin') ||
-      request.nextUrl.pathname.startsWith('/dashboard') ||
-      request.nextUrl.pathname.startsWith('/control')) {
-
-    const authHeader = request.headers.get('authorization');
-    const basicAuth = process.env.ADMIN_BASIC_AUTH;
-
-    if (!basicAuth) {
-      return new NextResponse('Admin access not configured', { status: 500 });
-    }
-
-    if (!authHeader || !authHeader.startsWith('Basic ')) {
-      return new NextResponse('Authentication required', {
-        status: 401,
-        headers: {
-          'WWW-Authenticate': 'Basic realm="Admin Area"',
-        },
-      });
-    }
-
-    const credentials = authHeader.split(' ')[1];
-    const [username, password] = Buffer.from(credentials, 'base64').toString().split(':');
-    const [expectedUsername, expectedPassword] = basicAuth.split(':');
-
-    if (username !== expectedUsername || password !== expectedPassword) {
-      return new NextResponse('Invalid credentials', {
-        status: 401,
-        headers: {
-          'WWW-Authenticate': 'Basic realm="Admin Area"',
-        },
-      });
-    }
-  }
-
   // For /manage and /editor routes, let them handle their own session-based auth
   // These routes will redirect to login if not authenticated
   if (request.nextUrl.pathname.startsWith('/manage') ||