feat: complete user management workflow

app/api/auth/register/route.ts

@@ -36,8 +36,13 @@ export async function POST(request: Request): Promise<Response> {
       password,
       organizationId: organizationId || undefined,
     });
-    await setSessionCookie(created.session.id);
-    return jsonSuccess("账号已创建", { account: created.account });
+    if (created.session) {
+      await setSessionCookie(created.session.id);
+    }
+    return jsonSuccess(organizationId ? "申请已提交，待机构管理员审批" : "账号已创建", {
+      account: created.account,
+      pendingApproval: !created.session,
+    });
   } catch (error) {
     const reason = error instanceof Error ? error.message : "账号创建失败";
     const status = reason === "账号已存在" ? 409 : 500;