🚀 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'],
     });
 

backend/src/modules/users/user.service.ts

@@ -21,8 +21,9 @@ export class UsersService {
    * إضافة مستخدم لمكتب محاسبة
    */
   async create(tenantId: string, dto: any): Promise<User> {
+    const normalizedEmail = dto.email?.trim().toLowerCase();
     const existing = await this.userRepository.findOne({
-      where: { email: dto.email, tenant_id: tenantId },
+      where: { email: normalizedEmail, tenant_id: tenantId },
     });
     
     if (existing) {
@@ -33,6 +34,7 @@ export class UsersService {
     
     const user = this.userRepository.create({
       ...dto,
+      email: normalizedEmail,
       password_hash: passwordHash,
       tenant_id: tenantId,
     } as Partial<User>);
@@ -85,6 +87,10 @@ export class UsersService {
       delete dto.password;
     }
 
+    if (dto.email) {
+      dto.email = dto.email.trim().toLowerCase();
+    }
+
     Object.assign(user, dto);
     
     try {