feat(admin): configure model providers from database

frontend/src/lib/admin/http.ts

@@ -63,7 +63,7 @@ export function adminProofSigningSecret(
 ): string {
   const secret = env.BETTER_AUTH_USER_SECRET?.trim();
   if (!secret || secret.length < 32) {
-    throw new AdminAuthorizationError("MFA 服务暂时不可用", 503);
+    throw new AdminAuthorizationError("安全验证服务暂时不可用", 503);
   }
   return secret;
 }
@@ -86,27 +86,11 @@ export function readAdminMfaStatus(
   return resolveAdminMfaStatus(session.requiresMfa, enrolled, verified);
 }
 
-export function requireAdminMfaIfRequired(
-  request: Request,
-  session: AdminSession,
-): AdminMfaStatus {
-  const status = readAdminMfaStatus(request, session);
-  if (!status.required) return status;
-  if (!status.enrolled) {
-    throw new AdminAuthorizationError("此管理员角色必须先启用 MFA", 403);
-  }
-  if (!status.verified) {
-    throw new AdminAuthorizationError("请先完成当前会话的 MFA 验证", 403);
-  }
-  return status;
-}
-
 export async function requireHighRiskAdminMutation(
   request: Request,
   permission: AdminPermission,
 ): Promise<AdminSession> {
   const session = await requireAdminMutation(request, permission);
-  requireAdminMfaIfRequired(request, session);
 
   const origin = new URL(request.url).origin;
   const valid = verifyHighRiskAdminProof(