feat: Implement admin user management endpoints and user update schema

app/repositories/user.py

@@ -4,6 +4,7 @@ from typing import Any
 
 from sqlmodel import select
 from sqlmodel.ext.asyncio.session import AsyncSession
+from sqlalchemy.orm import selectinload
 
 from app.core.logging import get_logger
 from app.models.plan import Plan
@@ -20,6 +21,42 @@ class UserRepository(BaseRepository[User]):
         """Initialize the user repository."""
         super().__init__(User, session)
 
+    async def get_all_with_plan(
+        self,
+        limit: int = 100,
+        offset: int = 0,
+    ) -> list[User]:
+        """Get all users with plan relationship loaded."""
+        try:
+            statement = (
+                select(User)
+                .options(selectinload(User.plan))
+                .limit(limit)
+                .offset(offset)
+            )
+            result = await self.session.exec(statement)
+            return list(result.all())
+        except Exception:
+            logger.exception("Failed to get all users with plan")
+            raise
+
+    async def get_by_id_with_plan(self, entity_id: int) -> User | None:
+        """Get a user by ID with plan relationship loaded."""
+        try:
+            statement = (
+                select(User)
+                .options(selectinload(User.plan))
+                .where(User.id == entity_id)
+            )
+            result = await self.session.exec(statement)
+            return result.first()
+        except Exception:
+            logger.exception(
+                "Failed to get user by ID with plan: %s",
+                entity_id,
+            )
+            raise
+
     async def get_by_email(self, email: str) -> User | None:
         """Get a user by email address."""
         try: