Fix LLM validation and dashboard health hot paths

backend/src/core/auth/repository.py

@@ -13,7 +13,7 @@
 # [SECTION: IMPORTS]
 from typing import List, Optional
 
-from sqlalchemy.orm import Session
+from sqlalchemy.orm import Session, selectinload
 
 from ...models.auth import Permission, Role, User
 from ...models.profile import UserDashboardPreference
@@ -53,7 +53,12 @@ class AuthRepository:
                 raise ValueError("username must be a non-empty string")
             
             logger.reason(f"Querying user by username: {username}")
-            user = self.db.query(User).filter(User.username == username).first()
+            user = (
+                self.db.query(User)
+                .options(selectinload(User.roles).selectinload(Role.permissions))
+                .filter(User.username == username)
+                .first()
+            )
             
             if user:
                 logger.reflect(f"User found: {username}")
@@ -199,4 +204,4 @@ class AuthRepository:
 
 
 # [/DEF:AuthRepository:Class]
-# [/DEF:backend.src.core.auth.repository:Module]
+# [/DEF:backend.src.core.auth.repository:Module]