🐛 fix(server): resolve CI lint and test failures after canary merge

- Drop stale packages/business-server/src/better-auth.ts (removed in #15589
  but accidentally re-introduced during rebase) — fixes missing
  better-auth-harmony types.
- Relax casdoor/logto webhook route signatures from NextResponse to Response
  to match the WebhookUserService now returning Web Response.
- Mock createAuthEndpoint in define-config.test.ts so the devLocalLogin
  plugin can be constructed under the better-auth/plugins mock.

packages/business-server/src/better-auth.ts

@@ -1,7 +0,0 @@
-import type { emailHarmony } from 'better-auth-harmony';
-
-export type BusinessEmailHarmonyOptions = NonNullable<Parameters<typeof emailHarmony>[0]>;
-
-export const businessEmailHarmonyOptions = {
-  allowNormalizedSignin: false,
-} satisfies BusinessEmailHarmonyOptions;

src/app/(backend)/api/webhooks/casdoor/route.ts

@@ -6,7 +6,7 @@ import { WebhookUserService } from '@/server/services/webhookUser';
 
 import { validateRequest } from './validateRequest';
 
-export const POST = async (req: Request): Promise<NextResponse> => {
+export const POST = async (req: Request): Promise<Response> => {
   const payload = await validateRequest(req, authEnv.CASDOOR_WEBHOOK_SECRET);
 
   if (!payload) {

src/app/(backend)/api/webhooks/logto/route.ts

@@ -6,7 +6,7 @@ import { WebhookUserService } from '@/server/services/webhookUser';
 
 import { validateRequest } from './validateRequest';
 
-export const POST = async (req: Request): Promise<NextResponse> => {
+export const POST = async (req: Request): Promise<Response> => {
   const payload = await validateRequest(req, authEnv.LOGTO_WEBHOOK_SIGNING_KEY!);
 
   if (!payload) {

src/libs/better-auth/define-config.test.ts

@@ -40,6 +40,7 @@ vi.mock('better-auth/minimal', () => ({
 
 vi.mock('better-auth/plugins', () => ({
   admin: vi.fn(() => ({ id: 'admin' })),
+  createAuthEndpoint: vi.fn(() => vi.fn()),
   emailOTP: vi.fn(() => ({ id: 'email-otp' })),
   genericOAuth: vi.fn(() => ({ id: 'generic-oauth' })),
   magicLink: vi.fn(() => ({ id: 'magic-link' })),