refactor: update module docstrings for clarity and consistency

backend/app/models/users.py

@@ -1,3 +1,5 @@
+"""User model storing identity and profile preferences."""
+
 from __future__ import annotations
 
 from uuid import UUID, uuid4
@@ -8,6 +10,8 @@ from app.models.base import QueryModel
 
 
 class User(QueryModel, table=True):
+    """Application user account and profile attributes."""
+
     __tablename__ = "users"
 
     id: UUID = Field(default_factory=uuid4, primary_key=True)
@@ -21,5 +25,7 @@ class User(QueryModel, table=True):
     context: str | None = None
     is_super_admin: bool = Field(default=False)
     active_organization_id: UUID | None = Field(
-        default=None, foreign_key="organizations.id", index=True
+        default=None,
+        foreign_key="organizations.id",
+        index=True,
     )