feat: added patch promocode, promocode stat, user signup/signin, user profile get/patch, user feed

also bug fixes and improvements

solution/apps/user/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 5.1.5 on 2025-01-21 11:05
+# Generated by Django 5.1.5 on 2025-01-23 17:54
 
 import django.core.validators
 import django_countries.fields
@@ -24,6 +24,7 @@ class Migration(migrations.Migration):
                 ('avatar_url', models.URLField(blank=True, max_length=350, null=True)),
                 ('age', models.PositiveSmallIntegerField(validators=[django.core.validators.MaxValueValidator(100)])),
                 ('country', django_countries.fields.CountryField(max_length=2)),
+                ('country_raw', models.CharField(max_length=2)),
                 ('password', models.CharField(max_length=60, validators=[django.core.validators.RegexValidator('^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[@$!%*?&])[A-Za-z\\d@$!%*?&]{8,}$')])),
                 ('token_version', models.BigIntegerField(default=0)),
             ],