feat(backend): added auth, reviews, users modules

also provided tests

src/backend/api/v1/auth/schemas.py

@@ -0,0 +1,64 @@
+from typing import ClassVar
+
+from ninja import ModelSchema, Schema
+from pydantic import Field
+
+from apps.users.models import User
+
+
+class LoginIn(Schema):
+    username: str = Field(
+        ...,
+        min_length=1,
+        max_length=150,
+        description="Username of the account",
+    )
+    password: str = Field(
+        ...,
+        min_length=1,
+        description="Account password",
+    )
+
+
+class TokenPairOut(Schema):
+    access: str = Field(
+        ...,
+        description=(
+            "Short-lived JWT access token (used in Authorization header)"
+        ),
+    )
+    refresh: str = Field(
+        ...,
+        description=(
+            "Long-lived JWT refresh token (used to obtain a new access token)"
+        ),
+    )
+
+
+class TokenRefreshIn(Schema):
+    refresh: str = Field(
+        ...,
+        min_length=1,
+        description="A valid, non-expired refresh token",
+    )
+
+
+class TokenRefreshOut(Schema):
+    access: str = Field(
+        ...,
+        description="Newly issued JWT access token",
+    )
+
+
+class MeOut(ModelSchema):
+    class Meta:
+        model = User
+        fields: ClassVar[tuple[str, ...]] = (
+            User.id.field.name,
+            User.username.field.name,
+            User.email.field.name,
+            User.role.field.name,
+            User.first_name.field.name,
+            User.last_name.field.name,
+            User.is_active.field.name,
+        )