Add RBAC: admin user management, audit log, runtime settings, delete PC

server/auth.py

@@ -74,6 +74,20 @@ def require_admin(user: models.User = Depends(get_current_user)):
     return user
 
 
+def log_action(db: Session, user: Optional[models.User], action: str, details: Optional[str] = None):
+    try:
+        entry = models.AuditLog(
+            user_id=user.id if user else None,
+            username=user.username if user else None,
+            action=action,
+            details=details,
+        )
+        db.add(entry)
+        db.commit()
+    except Exception:
+        db.rollback()
+
+
 def create_default_admin(db: Session) -> Optional[models.User]:
     if not settings.CREATE_ADMIN_ON_STARTUP:
         return None