fix: enforce Heicode-only login and remove ClawdRouter enum residue

Backend listLoginProviders() was iterating ['taijiaicloud','clawdrouter']
and throwing 500 because clawdrouter preset was already removed from
providerPresets.json. Narrowing SUPPORTED_LOGIN_PROVIDER_IDS and the two
Zod enums to ['taijiaicloud'] only, plus tightening the desktop
HeicodeProviderId type to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cc-haha/desktop/src/api/heicodeAuth.ts

@@ -1,11 +1,11 @@
 // desktop/src/api/heicodeAuth.ts
 //
-// HeiCode 双 Provider 登录后端的客户端封装。
+// Heicode 单 Provider 登录后端的客户端封装。
 // 对应路由: src/server/api/heicode-auth.ts
 
 import { api } from './client'
 
-export type HeicodeProviderId = 'taijiaicloud' | 'clawdrouter'
+export type HeicodeProviderId = 'taijiaicloud'
 
 export type HeicodeLoginProviderInfo = {
   id: HeicodeProviderId

cc-haha/src/server/api/heicode-auth.ts

@@ -38,7 +38,7 @@ import { ApiError, errorResponse } from '../middleware/errorHandler.js'
 
 const providerService = new ProviderService()
 
-const SUPPORTED_LOGIN_PROVIDER_IDS = ['taijiaicloud', 'clawdrouter'] as const
+const SUPPORTED_LOGIN_PROVIDER_IDS = ['taijiaicloud'] as const
 type SupportedLoginProviderId = (typeof SUPPORTED_LOGIN_PROVIDER_IDS)[number]
 
 function isSupportedLoginProvider(id: string): id is SupportedLoginProviderId {
@@ -46,13 +46,13 @@ function isSupportedLoginProvider(id: string): id is SupportedLoginProviderId {
 }
 
 const LoginRequestSchema = z.object({
-  providerId: z.enum(['taijiaicloud', 'clawdrouter']),
+  providerId: z.enum(['taijiaicloud']),
   apiKey: z.string().min(8, 'API Key 长度过短'),
   displayName: z.string().min(1).optional(),
 })
 
 const OAuthStartSchema = z.object({
-  providerId: z.enum(['taijiaicloud', 'clawdrouter']),
+  providerId: z.enum(['taijiaicloud']),
 })
 
 type OAuthSession = {