🚀 Fix: Login case-sensitivity & Restore Super Admin AI metrics access

backend/src/modules/auth/auth.service.ts

@@ -100,8 +100,9 @@ export class AuthService {
    * تسجيل دخول
    */
   async login(dto: LoginDto) {
+    const normalizedEmail = dto.email.trim().toLowerCase();
     const user = await this.dataSource.getRepository(User).findOne({
-      where: { email: dto.email, is_active: true },
+      where: { email: normalizedEmail, is_active: true },
       select: ['id', 'email', 'password_hash', 'tenant_id', 'role', 'name'],
     });